the figure. The **area** **of** a plane geometric figure is the amount **of** surface in a region. perimeter **area** **Triangle** h b a c Perimeter = a + b + c **Area** = bh The height **of** a **triangle** is measured perpendicular to the base. Rectangle **and** Square w l s Perimeter = 2w + 2lPerimeter = 4s **Area** = lwArea = s 2 **Parallelogram** b a h Perimeter = 2a + 2b **Area** = hb **Area** **of** a **parallelogram** = **area** **of** rectangle with width = h **and** length = b Trapezoid/

Education, Inc. All rights reserved. Slide 12.2- 8 Example 12-5b Show that the **triangles** are congruent. Copyright © 2010 Pearson Education, Inc. All rights reserved. Slide 12.2- 9 Example 12-6a Using the definition **of** a **parallelogram** **and** the property that opposite sides in a **parallelogram** are congruent prove that the diagonals **of** a **parallelogram** bisect each other. We need to show that BO DO/

the **area** **of** **parallelograms** **and** **triangles**. I recognise when it is possible to use the formulae for the **area** **of** shapes. I can calculate, estimate **and** compare volume **of** cubes **and** cuboids, using standard units. I recognise when it is possible to use the formulae for the volume **of** shapes. I can solve problems involving the calculation **and** conversion **of** units **of** measure, using decimal notation up to 3 decimal places where appropriate. **Geometry** – properties **of**/

or side lengths. 5 in, 8 in, 5 in 10 **Geometry**: Angles **and** Polygons A.**parallelogram**, rectangle, rhombus, square B.trapezoid, square, prism, **parallelogram** C.cone, square, circle, **triangle** 5Min 8-1 (over Lesson 10-7) What type(s) **of** quadrilateral has (have) the following properties: two pairs **of** parallel sides 10 **Geometry**: Angles **and** Polygons A.cone, prism B.**triangle**, prism C.rectangle, square 5Min 8-2 (over Lesson/

the pieces is the sum **of** the **areas** **of** the pieces. 6.7 **Areas** **of** **Triangles** **and** Quadrilaterals Recall that a rectangle with base b **and** height h has an **area** **of** A = bh. You can use the **Area** Addition Postulate to see that a **parallelogram** has the same **area** as a rectangle with the same base **and** height. 6.7 **Areas** **of** **Triangles** **and** Quadrilaterals Remember that rectangles **and** squares are also **parallelograms**. The **area** **of** a square with side s/

**Geometry** 11.2 **Areas** **of** **Parallelograms**, Rhombuses, **and** **Triangles** **Parallelogram** A = bh The length **of** the altitude. Base Height Any side **of** the **parallelogram** The altitude is defined as any segment perpendicular to the line containing the base from any point on the opposite side. **Parallelogram** A = bh Perpendicular to the base(altitude). Base Height Any side **of** the **parallelogram** Check this out! You would find the same **area** either way you solved! Solve. 1/

not on a straight line. (8.F.A.3) (DOK 1,2) **Geometry** Solve real-world **and** mathematical problems involving **area**, surface **area**, **and** volume. (6.G.A) 1.Find the **area** **of** right **triangles**, other **triangles**, special quadrilaterals, **and** polygons by composing into rectangles or decomposing into **triangles** **and** other shapes; apply these techniques in the context **of** solving real-world **and** mathematical problems. (6.G.A.1) (DOK 1,2) 2.Find/

Math 7 Unit 3 **Geometry** **and** Measurement The **area** **of** a **triangle** is related to the **area** **of** a **parallelogram** with the same base **and** height. True or False The **area** **of** a **triangle** is related to the **area** **of** a **parallelogram** with the same base **and** height. True Angle bisectors can be constructed by using a compass **and** a ruler. True or False Angle bisectors can be constructed by using a compass **and** a ruler. True The drawing/

formula A = 1/2 ab sin(C) for the **area** **of** a **triangle** by drawing an auxiliary line from a vertex perpendicular to the opposite side. 10. (+) Prove the Laws **of** Sines **and** Cosines **and** use them to solve problems. 11. (+) Understand **and** apply the Law **of** Sines **and** the Law **of** Cosines to find unknown measurements in right **and** non-right **triangles** (e.g., surveying problems, resultant forces). Classroom Instruction Similarity/

for **area** **of** circles, **triangles**, **and** **parallelograms**. Objective/goals: Students will find the **area** formulas for circles, squares, rectangles, **triangles**, **and** **parallelograms** (2.4.K1h). Kansas State Standard/Benchmark/Indicator; M.7.3.2.K4 Standard: **Geometry** Benchmark: Measurement **and** Estimation Indicator: Knows **and** uses perimeter **and** **area** formulas for circles, squares, rectangles, **triangles**, **and** **parallelograms** Explanation **of** Indicator Find perimeter (distance around the outside) **and** **area** (square units **of** space/

to calculate probability? how do you calculate probability? Prove **parallelogram** **area** conjecture using 2-column or flowchart proof Given: ABCD is a **parallelogram** **and** h is an altitude. Using **Area** Formulas Example 7 Calculate the **area** **of** the **triangle** below: -Draw an obtuse **triangle**. -Make a copy **of** it. -Rearrange both **triangles** to make a shape for which you already know the **area**. **Geometry** 16/17 Jan 2012 WARM UP- THINK- 2 minutes/

Congruent: Similar: Similar **Triangles** **Triangle** Inequality The sum **of** the lengths **of** any two sides **of** a **triangle** is greater than the length **of** the third side. **Parallelograms** & Squares & Rectangles **Parallelogram** Square Rectangle Example Other Polygons To find the total number **of** degrees for the interior: Circles Radius: Arc: Tangent: Circumference: **Area**: Example Coordinate **Geometry** Slope: Parallel Lines: Perpendicular Lines: Midpoint formula: Example A (3, 4) **and** B ( 7, 8/

10.2/10.3 **Parallelograms** **and** Trapezoids Objectives Slide 8.4- 64 1.Find the perimeter **and** **area** **of** a **parallelogram**. 2.Find the perimeter **and** **area** **of** a trapezoid. Copyright © 2010 Pearson Education, Inc. All rights reserved. A **parallelogram** is a four-sided /Find the **area** **of** each **triangle**. a. Parallel Example 2 Find the **Area** **of** a **Triangle** Slide 8.5- 79 Copyright © 2010 Pearson Education, Inc. All rights reserved. Find the **area** **of** each **triangle**. b. Parallel Example 2 continued Find the **Area** **of** a **Triangle** Slide 8/

to another. Vocabulary ________ _______ ________ _______ _____________ __________ _________ A **parallelogram** having four right angles. A pyramid is a polyhedron that has a base, which can be any polygon, **and** three or more triangular faces that meet at a point called the apex. Square - Rectangle - **Triangle** - Pyramid- Trapezoid - Surface **Area** - A quadrilateral with one pair **of** parallel sides A rectangle having four right angles/

**parallelogram** having four right angles. a polyhedron that has a base, which can be any polygon, **and** three or more triangular faces that meet at a point called the apex. Square - Rectangle - **Triangle** - Pyramid- Trapezoid - Surface **Area** - A quadrilateral with one pair **of** parallel sides A rectangle having four right angles **and** four congruent sides. A figure with three sides **and** three angles. The total **area** **of** the surface **of**/

diagonal line dividing the rectangle in half. What two shapes make up the rectangle?? Decomposing shapes 1. Draw a **parallelogram** on your paper 2. Draw a diagonal line dividing up your **parallelogram** What shapes make up a **parallelogram**?? **Area** **of** **Triangles** Since **Triangles** are half **of** **parallelograms**, squares, **and** rectangles use that knowledge **and** see if you can find the **area** **of** the **triangle** below: Try this one….. **Area** **of** a **Triangle** Click here for practice with **area** **of** **triangle**

far is it from Elisabeth St to Russell St? The **area** **of** a **parallelogram** is the base x height. LC (O/L & H/L). Theorem 18 The **area** **of** a **parallelogram** is the base x height. LC (O/L & H/L). * In a **parallelogram**, opposite sides are equal, **and** opposite angles are equal. Conversely (1) If the opposite angles **of** a convex quadrilateral are equal, then it is a/

**parallelogram** rhombus trapezoid Lesson 7 MI/Vocab 10-7 Quadrilaterals Standard 5MG2.1 Measure, identify, **and** draw angles, perpendicular **and** parallel lines, rectangles, **and** **triangles** by using appropriate tools. Lesson 7 Standard 1 10-7 Quadrilaterals Standard 5MG2.2 Know that the sum **of** the angles **of** any **triangle** is 180° **and** the sum **of** the angles **of** any quadrilateral is 360° **and**/10-1 (over Chapter 9) Lesson 10-2 (over Lesson 10-1) **Geometry**: Angles **and** Polygons 10 Lesson 10-1 (over Chapter 9) Lesson 10-2 (over/

for **Triangles** **and** Quadrilaterals 9-2Developing Formulas for Circles **and** Regular Polygons 9-3Composite Figures 9-4Perimeter **and** **Area** in the Coordinate Plane 9-5Effects **of** Changing Dimensions Proportionally 9-6Geometric Probability Chapter 10 Spatial Reasoning 10-1Solid **Geometry** 10-2Representations **of** Three-Dimensional Figures 10-3Formulas in Three Dimensions 10-4Surface **Area** **of** Prisms **and** Cylinders 10-5Surface **Area** **of** Pyramids **and** Cones 10-6Volume **of** Prisms **and** Cylinders 10-7Volume **of** Pyramids **and** Cones/

CHAPTER 8 **Geometry** Slide 2Copyright 2012, 2008, 2004, 2000 Pearson Education, Inc. 8.1Basic Geometric Figures 8.2Perimeter 8.3Area 8.4Circles 8.5Volume **and** Surface **Area** 8.6Relationships Between Angle Measures 8.7Congruent **Triangles** **and** Properties **of** **Parallelograms** 8.8Similar **Triangles** OBJECTIVES 8.7 Congruent **Triangles** **and** Properties **of** **Parallelograms** Slide 3Copyright 2012, 2008, 2004, 2000 Pearson Education, Inc. aIdentify the corresponding parts **of** congruent **triangles** **and** show why **triangles** are congruent/

able to compare **and** contrast isosceles **triangles**, equilateral **triangles**, **and** scalene **triangles**. Students should understand that the measure **of** all **of** the angles **of** a **triangle** add up to 180°. Quadrilaterals I would like the students to be able to compare **and** contrast quadrilaterals so that they will know **and** understand the individual properties **of** the most common quadrilaterals. The students should be able to identify squares, rectangles, rhombuses, **parallelograms**, **and** trapezoids. Other Polygons/

Holt **Geometry** Lesson Quiz: Part I Find each measurement. 1. the height **of** the **parallelogram**, in which A = 182x2 mm2 h = 9.1x mm 2. the perimeter **of** a rectangle in which h = 8 in. **and** A = 28x in2 P = (16 + 7x) in. Lesson Quiz: Part II 3. the **area** **of** the trapezoid A = 16.8x ft2 4. the base **of** a **triangle** in which h = 8 cm **and** A/

Lesson 3.1.2 **Areas** **of** Polygons 2 Lesson 3.1.2 **Areas** **of** Polygons California Standard: Measurement **and** **Geometry** 1.2 Use formulas routinely for finding the perimeter **and** **area** **of** basic two-dimensional figures, **and** the surface **area** **and** volume **of** basic three-dimensional figures, including rectangles, **parallelograms**, trapezoids, squares, **triangles**, circles, prisms, **and** cylinders. What it means for you: You’ll use formulas to find the **areas** **of** regular shapes. Key words: **area** **triangle** **parallelogram** trapezoid formula/

(3, r) are the vertices **of** a **parallelogram** ABCD, calculate the values **of** p **and** r. Let M be the midpoint **of** AC. Exercise 7.1 Page 141 Question 4 M is also the midpoint **of** BD. Coordinate **Geometry** Objectives 2.2 **Areas** **of** **Triangles** **and** Quadrilaterals Objectives In this lesson, you will learn how to find the **areas** **of** rectilinear figures given their vertices. 7.2 **Areas** **of** **Triangles** **and** Quadrilaterals Objectives In this lesson you/

acute **triangle**. [T, F] OBJECTIVE: Define **and** discover properties **of** mid-segments in **triangles** **and** trapezoids. ACTIVITIES: Pg. 279 #12 – 16. [activity on www.regentspreps.org www.regentspreps.org HOME LEARNING: www.QUIA.COM activity.www.QUIA.COM **GEOMETRY**; AGENDA; DAY 71; TUE. [DEC. 06, 2011] BENCH WARMER: Write an equation that passes through the points (3, 6) **and** (5, 9) Properties **of** a **Parallelogram** OBJECTIVE: Discover properties **of** **parallelograms** ACTIVITIES/

Standards.. Measurement **and** **Geometry** (Grade 5) 1.0 Students understand **and** compute the volumes **and** **areas** **of** simple objects: 1.1 Derive **and** use the formula for the **area** **of** a **triangle** **and** **of** a **parallelogram** by comparing it with the formula for the **area** **of** a rectangle (i.e., two **of** the same **triangles** make a **parallelogram** with twice the **area**; a **parallelogram** is compared with a rectangle **of** the same **area** by cutting **and** pasting a right **triangle** on the **parallelogram**). 1.4/

for **area** **of** a rectangle, **triangle** **and** **parallelogram** work out the **area** **of** a rectangle work out the **area** **of** a **parallelogram** calculate the **area** **of** shapes made from **triangles** **and** rectangles calculate the **area** **of** shapes made from compound shapes made from two or more rectangles, for example an L shape or T shape calculate the **area** **of** shapes drawn on a grid calculate the **area** **of** simple shapes work out the surface **area** **of** nets made up **of** rectangles **and** **triangles** calculate the **area** **of**/

). If we make a congruent copy **of** this **triangle** **and** move that **triangle** into place as shown (that is, by rotating it 180 degrees), we form a **parallelogram**. Figure 10.13 26 **Area** The base **of** the **parallelogram** **and** the base **of** the **triangle** are identical, **and** so are the heights. If the **area** **of** the **parallelogram** = base height, then (since the **area** **of** the two **triangles** is equal to the **area** **of** the **parallelogram**), (base height), or A = b h/

for **area** **of** a rectangle, **triangle** **and** **parallelogram** work out the **area** **of** a rectangle work out the **area** **of** a **parallelogram** calculate the **area** **of** shapes made from **triangles** **and** rectangles calculate the **area** **of** shapes made from compound shapes made from two or more rectangles, for example an L shape or T shape calculate the **area** **of** shapes drawn on a grid calculate the **area** **of** simple shapes work out the surface **area** **of** nets made up **of** rectangles **and** **triangles** calculate the **area** **of**/

include: opposite sides are congruent, opposite angles are congruent, the diagonals **of** a **parallelogram** bisect each other, **and** conversely, rectangles are **parallelograms** with congruent diagonals. © 2013 UNIVERSITY **OF** PITTSBURGH The CCSS for Mathematical Content CCSS Conceptual Category – **Geometry** Common Core State Standards, 2010 Similarity, Right **Triangles**, **and** Trigonometry (G-SRT) Define trigonometric ratios **and** solve problems involving right **triangles** G-SRT.C.6 Understand that by similarity, side ratios in/

**Areas** **of** **Parallelograms** **and** **Triangles** **Geometry** Unit 4, Lesson 1 Theorem 5-2: **Area** **of** a **Parallelogram** The **area** **of** a **parallelogram** is the product **of** any base **and** the corresponding height A = bh Any side **of** the **parallelogram** can be called the base Definitions Altitude – any segment perpendicular to the line containing the base drawn from the side opposite the base. Definitions Height – the length **of** the altitude. Find the **Area** Find the **Area** **of** the given **Parallelogram**: A = bh = (12in/

**Geometry** 7 th Grade Math Ms. Casazza Click on the button to go the next slide! **Triangle** Square Rectangle Rhombus **Parallelogram** Circle Pentagon Hexagon Click on one **of** the shapes to know more about it Click here to start the quiz! **Triangle** A **triangle** has three sides. To find the **area** **of** the **triangle** you use this formula -1/2bh *the b stands for base **and** the h stands for height/

properties. The two most common subjects in **geometry** are: 1) Plane **Geometry** 2) Solid **Geometry** Plane **geometry**: is the study **of** plane figures in the plane such as points, lines, line segments, rays, angles, circles, **triangles**, quadrilaterals, **and** other polygons... shapes that can be drawn on a piece **of** paper. Solid **Geometry**: is the study **of** three dimensional objects like cubes **and** pyramids. It is called three- dimensional, or 3D because/

.21: **Area** **of** a **Parallelogram** The **area** **of** a **parallelogram** is the product **of** a base **and** its corresponding height. Remember the height must be perpendicular to one **of** the bases. The height will be given to you or you will need to find it. To find it, use Pythagorean Theorem a 2 + b 2 = c 2 A = bh b h Theorem 6.22: **Area** **of** a **Triangle** The **area** **of** a **triangle** is one/

, 2015 AGENDA Problem Solving – Where are the Cookies? Estimating **and** Measurement **Geometry** –**Area** **of** **parallelograms**, **triangles** **and** trapezoids –Volume **of** rectangular prisms Others??? Mrs. James left a tray **of** cookies on the counter early one morning. Larry walked by before lunch **and** decided to take 1/3 **of** the cookies on the tray. Later that afternoon Barry came in **and** ate 1/4 **of** the remaining cookies. After supper Terry saw the tray/

**Areas** **of** **Parallelograms**, **Triangles**, & Rhombuses Keystone **Geometry** **Area** **of** a **Parallelogram** **Parallelogram** **Area**: The **area** **of** a **parallelogram** equals the product **of** a base & the height to that base. (A = bh) b h **Area** **of** a **Triangle** b h b h **Triangle** **Area** Theorem: The **area** **of** a **triangle** equals half the product **of** a base & the height to that base. (A = bh) **Area** **of** a Rhombus Rhombus **Area** Theorem: The **area** **of** a rhombus is equal to one half the product **of** its diagonals. Note! A Rhombus is also/

khanacademy.org **GEOMETRY**; AGENDA; DAY 65; FRI. [NOV. 22, 2013] OBJECTIVE: Discuss the properties **of** Mid- segments **of** a **triangle** **and** trapezoid. /**OF** **PARALLELOGRAMS** pg. 281 - 286 OBJECTIVE: To use new conjectures about **parallelograms** to answer questions. ACTIVITIES: Pg. 283 # 1 – 13. HOME LEARNING: Pg. 285 # 15 – 19. **GEOMETRY**; AGENDA; DAY 70; TUE. [DEC. 03, 2013] WRITING LINEAR EQUATIONS; PG. 287 -290. OBJECTIVE: To find the equation **of** a graph from given points, to write equations that are perpendicular **and**/

**of** a **parallelogram** ABCD, calculate the values **of** p **and** r. M is also the midpoint **of** BD. Coordinate **Geometry** Exercise 7.1, qn 4 7.2 **Areas** **of** **Triangles** **and** Quadrilaterals In this lesson, you will learn how to find the **areas** **of** rectilinear figures given their vertices. Coordinate **Geometry** Objectives ABC is a **triangle**. We will find its **area**. Construct points D **and** E so that ADEC is a trapezium. Coordinate **Geometry** **Area** **of** **Triangles** ABC is a **triangle**/

1 2 1 2 1 2 1 2 1 2 1 2 10-2 **Areas** **of** **Parallelograms** **and** **Triangles** Lesson 10-1 Lesson Quiz 1. Find the **area** **of** the **parallelogram**. 2. Find the **area** **of** XYZW with vertices X(–5, –3), Y(–2, 3), Z(2, 3) **and** W(–1, –3). 3. A **parallelogram** has 6-cm **and** 8-cm sides. The height corresponding to the 8-cm base is 4.5/

base **and** corresponding apex **and** height **of** **triangle** or **parallelogram**, transversal line, circle, radius, diameter, chord, arc, sector, circumference **of** a circle, disc, **area** **of** a disc, circumcircle, point **of** contact **of** a tangent, vertex, vertices (**of** angle, **triangle**, polygon), endpoints **of** segment, arms **of** an angle, equal segments, equal angles, adjacent sides, angles, or vertices **of** **triangles** or quadrilaterals, the side opposite an angle **of** a **triangle**, opposite sides or angles **of** a quadrilateral, centre **of** a/

4 **Area** **of** left-side **triangle** = 1/2 **of** 4 3 **Area** **of** left-side **triangle** = 1/2 **of** 4 3 **Area** **of** right-side **triangle** = 1/2 **of** 4 4 **Area** **of** right-side **triangle** = 1/2 **of** 4 4 **Area** **of** whole **triangle** = 1/2 **of** 4 7 **Area** **of** whole **triangle** = 1/2 **of** 4 7 **Area** is amount **of** (2-D) “stuff” Inventing **area** formulas Two congruent **triangles** form a **parallelogram** Two congruent **triangles** form a **parallelogram** **Area** **of** **parallelogram** = base height **Area** **of** **parallelogram** = base height So… **Area** **of** **triangle** = 1/2 base height So… **Area** **of**/

Obtuse Reflex **Geometry** **and** measure 2 **Area** Length Width **Triangle** Perimeter Kilometre Shape Measure Measurement Kilogram Gram Rectangle Scale Instrument Thermometer Protractor Tonne Litre Centilitre millilitre Millimetre Centimetre Square units **Geometry** **and** measure 3 Line **of** symmetry Translation Centre **of** rotation Object Rotation Clockwise Anticlockwise Reflective symmetry Mirror line Image Reflection Transformation **Geometry** **and** measure 4 Sphere Hemisphere Solid Protractor Ruler **Triangle** **Parallelogram** Net/

**of** equal length **and** four right angles. Abstract- Students understand that a rectangle is a **parallelogram** because it has all the properties **of** **parallelograms**. Students find that some combinations **of** properties signal certain classes **of** figures **and** some do not; thus the seeds **of** /with at least one pair **of** parallel sides. Properties **of** **triangles** **Geometry** progression Where does this begin? Where is it going? Please read pages 14 **and** 15 **of** the **Geometry** Progression. I pushed it out to you, **and** it is posted on the/

the segment in a given ratio.directed line segment G.GPE.B.7 Use coordinates to compute perimeters **of** polygons **and** **areas** **of** **triangles** **and** rectangles, e.g., using the distance formula. TREE Method One: Illustrative Math: When are two lines perpendicular ? Method Two: Module 4 Connecting Algebra **and** **Geometry** Through Coordinates Topic B Lessons 5-8 Lesson 5: Using the Pythagorean Theorem If OA is perpendicular to/

width. The **area** “A” **of** a rectangle is the product **of** the length l **and** the width w. l w Find the **area** **of** the rectangle 14 in. 10 in. The **area** **of** the rectangle is 140 square inches. NOTE: units indicate **area** is being calculated Because the opposite sides **of** a **parallelogram** have the same length, the **area** **of** a **parallelogram** is closely related to the **area** **of** a ________. rectangle The **area** **of** a **parallelogram** is found/

, 6 Find **area** **AND** volume projects REVISIONS for DSH Kribz, due April Honors **Geometry** 4 th Quarter Project ONLINE DETAILS- PROPOSAL APPLICATION- ONLINE Preliminaries– due April Final project due- May 8 th video, song, skit, tutorial, rap, dance…. other? debrief what is surface **area**? how is surface **area** different than volume? how do you find surface **area** **of** a geometric solid? **area** summary A **parallelogram** = bh A **triangle** = ½ bh A/

) Honors **Geometry** - 3 more slides Pg 351 (2-24 even, 25,27, 36-42 even, 44,45) The trick to this problem is that there are two ways to find the **area** **of** this **parallelogram**: A = (10)(x) = (8)(6) 10x = 48 x = 4.8 10 6 x 8 A **triangle** has a height **of** 12 cm **and** an **area** **of** 48 cm 2 Find the length **of** the base. **Area** **of** **Triangle**/

two given points that partitions the segment in a given ratio. G-GPE.B.7 Use coordinates to compute perimeters **of** polygons **and** **areas** **of** **triangles** **and** rectangles, e.g., using the distance formula.★ ★Mathematical Modeling is a Standard for Mathematical Practice (MP4) **and** a Conceptual Category, **and** specific modeling standards appear throughout the high school standards indicated with a star (★). Where an entire domain is marked with/

**of** prism = height * **area**-**of**-base Volume **of** cone = ⅓ * H * R2 * H Surface are **of** cone = S * R * + R2 * S R h Volume **of** prism = height * **area**-**of**-base Volume **of** pyramid = ⅓ * height * **area**-**of**-base Volume **of** cylinder = height * R2 * 3-D **Geometry** Volume **of** sphere V = 4/3 * R3 * Surface are **of** sphere A = 4 * R2 * Example The height **of** a cone is 4m **and** its radius is 3m. What’s the surface **area** **and** the volume **of**/

Length **and** Sector **Area** — Plane **Geometry** ACT Math Arc Length **and** Sector **Area** — Plane **Geometry** Arc Length **and** Sector **Area** Arc length **and** sector **area** are proportional to the central angle. Make a ratio with it. **Parallelograms** — Plane **Geometry** ACT Math **Parallelograms** — Plane **Geometry** **Area** **of** a **Parallelogram** **Area**= base x height b h **Triangles** — Plane **Geometry** ACT Math **Triangles** — Plane **Geometry** **Area** **of** a **triangle** **Area** = ½ base x height h b 3D **Geometry** — Plane **Geometry** ACT Math 3D **Geometry** — Plane **Geometry** Volume/

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