We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byJazmine Wilson
Modified about 1 year ago
Area: Triangles and Trapezoids Lesson 10-2 p Start the Bellwork Quiz. 2. Have your HW, red pen, and book on your desk.
Triangles When finding the area of triangles, remember that a triangle is half of a parallelogram.
Triangles Now you can see why the formula for the area of a triangle makes sense: A = bhor A = bh 2
Triangles Let’s look at an example: 4 feet 5 feet A = bh = 4 (5) = or 10 ft 2
Try This Find the areas: 12 in. 3 ft. 5 mi. 6 miles 7 miles
Try This Find the areas: 12 in. 3 ft. 5 mi. 6 miles 7 miles 216 in 2 or 1.5 ft 2
Try This Find the areas: 12 in. 3 ft. 5 mi. 6 miles 7 miles 216 in 2 or 1.5 ft 2 15 mi 2
Trapezoids Trapezoids have different formula. It looks like this: A = h (b 1 + b 2 ) or A = h(b 1 + b 2 ) 2 b1b1 b2b2 h
Trapezoids A = h (b 1 + b 2 ) or A = h(b 1 + b 2 ) 2 Note that there are 2 bases—base 1 and base 2. The formula takes the average of the two bases multiplied by the height. b1b1 b2b2 h
Trapezoids Let’s try an example: A = h (b 1 + b 2 ) A = 3.5 (4 + 6) 2 2 A = 3.5 (5) = 17.5 ft 2 4 ft 6 feet 3.5 ft
Try This Find the area: 24 mm 33 mm 12 mm
Try This Find the area: 24 mm 33 mm 12 mm 342 mm 2
Try This Find the area: 4 feet 2 feet 4.5 feet
Try This Find the area: 4 feet 2 feet 4.5 feet 13 ft 2
Example Some shapes look unusual, but when you remember just 3 formulas, you can calculate the area. Which two shapes do you see in the figure at the left?
Example There is a square (parallelogram) and a triangle. To find the area, first find the area of the parallelogram and then add it to the area of the triangle.
Example 3 ft 2 ft The square has an area of A = bh or 3 (3) or 9 ft 2. The triangle has an area of A = ½ bh or ½ (3) (2) or 3 ft 2. The total area if or 12 ft 2
Try This Find the area: 4 cm 6 cm 8 cm 6 cm
Try This Here is a hint: 4 cm 6 cm 8 cm 6 cm
Try This Here is a hint: 4 cm 6 cm 8 cm 6 cm For the rectangle: A = bh A = 6 (4) = 24 cm 2 For the trapezoid: A = ½ h (b 1 + b 2 ) A = ½ (2) (4 + 6) A = 10 cm 2 Total area = = 34 cm 2
Try This Is there another way to divide this up? 4 cm 6 cm 8 cm 6 cm
Try This How about like this: 4 cm 6 cm 8 cm 6 cm
Try This How about like this: 4 cm 6 cm 8 cm 6 cm For the rectangle: A = bh = 8 (4) = 32 cm 2 For the triangle: A = ½ bh = ½ (2) (2) = 2 cm 2 The total area is or 34 cm 2
Agenda PA#38 Pp #8-16 even, 17, 19
Please start Bellwork # HW, red pen book on desk.
Agenda PA# Workbook pp.83 & 84 Benchmark 3 is Friday.
© 2007 M. Tallman. The area of this rectangle is 40 cm². If you divide this rectangle in half, what two shapes do you see? A = 40 cm²
Number Cube Challenge Juanita and Clarissa have 4 number cubes and are having fun making up number games one afternoon. Clarissa has an idea for a new.
Area in the amount of space inside an enclosed region. Area of Rectangle = base x height Base =10 Height = 6 Area = (10)(6) = 60 square units.
MODULE VI LET’S GO MEASURE A KITE! AREAS OF QUADRILATERALS We have already discussed how to find the area of certain parallelograms. Today, we are going.
Slope and y-intercept Lesson 8-3 p.397. Slope and y-intercepts When studying lines and their graphs (linear equations), we can notice two things about.
The National Certificate in Adult Numeracy Level 2 Skills for Life Support Strategies Module 7: Perimeter, area and volume.
Area and Perimeter Yes you do need to write this..
6-6 Volume of prisms and Cylinders Prism- a three-dimensional figure named for the shape of its bases. The two bases are congruent polygons. All of the.
Working with Shapes in Two Dimensions Two-Dimensional Objects.
Bellwork #42 HW, red pen, book on desk.
FeatureLesson Geometry Lesson Main (For help, go to Lesson 10-1.) 1. rectangle2. a triangle Lesson 10-2 Areas of Trapezoids, Rhombuses, and Kites.
Areas of Triangles and Quadrilaterals. Area of a Square The area of a square is the square of the length of its side, or A = s 2. Area Congruence If two.
Area Of Shapes. 8cm 2cm 5cm 3cm A1 A2 16m 12m 10m 12cm 7cm A1A2.
Geometry Formulas: Surface Area & Volume. A formula is just a set of instructions. It tells you exactly what to do! All you have to do is look at the.
Copyright©amberpasillas2010. Today we are going to find the Area of Parallelograms a nd the Area of Triangles.
How to calculate the area of a circle. Its as easy as pi.
Area Of Parallelograms Definition: A parallelogram is a quadrilateral with opposite sides parallel.
Areas of Triangles and Quadrilaterals STS Abu Dhabi Boys.
How much cardboard does it take to make a cereal box? Have you ever wondered?
Of. and a to the in is you that it at be.
Surface area is how much area is on the outside of a solid. We measure surface area with square units.
Problem 6.2 In A-D, make your drawings on centimeter grid paper. Remember that cm is the abbreviation for centimeters, and cm 2 is the abbreviation for.
Objective : Calculate the area of regular quadrilaterals. o Area is the space inside a 2D shape. o A quadrilateral is a 4 sided shape such as a square.
8cm 2cm How many squares do you need to fill the rectangle? Area of a rectangle = Length x Width.
Prime Time Circle the seven prime numbers that, when added together, equal 75. 3, 11, 14, 13, 5, 17, 12, 6, 19, 23, 7, 9 Remember a prime number is a number.
Ch 3 Sec 1: Slide #1 Columbus State Community College Chapter 3 Section 1 Problem Solving: Perimeter.
MODULE VI IT’S WHAT’S ON THE INSIDE THAT COUNTS!.
5-Minute Check on Lesson 11-1 Transparency 11-2 Click the mouse button or press the Space Bar to display the answers. Find the area and the perimeter of.
Area = base x height A = bh Note: The base and height create a right angle!
MOTION Three featured concepts are: Speed Velocity Acceleration.
© 2016 SlidePlayer.com Inc. All rights reserved.