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1 Circle Formulae 2 The area of a circle Tandi Clausen-May Click the mouse
2 Click the mouse only when you see or If you click too soon you will miss the best bits. Click the mouse Click to see Click the mouse
3 The area of a circle Tandi Clausen-May Click the mouse
4 We saw in Circle Formulae 1 that… Circumference = × Diameter Now, what about the area?
5 Imagine a circle made out of strands of beads. Open it out. Click the mouse Click to see the circle open
6 circumference radius (half the diameter) Let’s watch that again. It’s a triangle! base = circumference Click to see the circle open again height = radius (half the diameter) Click the mouse
7 circumference radius (half the diameter) = Circumference × Radius 2 Area of the triangle circle Area of the triangle We know how to find the area of a triangle. Click the mouse = Base × Height 2
8 = Circumference × Radius 2 Area Summary Click the mouse
9 The End Tandi Clausen-May
1 Circle Formulae 1 The circumference of a circle Tandi Clausen-May Click the mouse.
Polygon Areas 2 The area of a parallelogram and a triangle Tandi Clausen-May Click the mouse.
1 Circle Perimeter Formula The circumference of a circle Click the mouse.
Recap: This circle has a diameter of 1. What is its circumference? 1.
1 Squares, Rectangles and Sticks Tandi Clausen-May Click the mouse to continue.
1 The Circumference of a Circle Teaching Mathematics Visually and Actively Tandi Clausen-May.
Pythagorean Theorem, Perimeter, Circumference, Area ….
Circumference Lesson #33. What is Circumference? The distance around the outside of a circle is called the circumference (essentially, it is the perimeter.
1-5: USING FORMULAS IN GEOMETRY. PERIMETER & AREA RectangleSquareTriangle P = 2l + 2w or 2(l + w) A = lw P = 4s A = s 2 P = a + b + c A = ½ bh.
1 Angles 1 – What is an angle? Click the mouse. Click the mouse only when you see ‘Click the mouse’. Otherwise you will miss some of the dynamic bits.
Circles OCR Stage 6. diameter Circumference radius Tangent radius is diameter ÷ 2.
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Circles. diameter Circumference radius Circumference- the distance around the circle. About 3X the diameter.
The outside of the circle is called circumference The circumference is the distance around the circle.
The Circle. The language of circles Circumference: The distance round the circle Circumference: The distance round the circle Diameter: the distance from.
investigate the relationship between the diameter and circumference of a circle.
Circles Shape and Space. Formula for the area of a circle We can find the area of a circle using the formula radius Area of a circle = πr 2 Area of a.
Circles & Circumference Standard Math The circumference is the distance around a circle. Circumference Circumference is the perimeter of circles. Radius.
Practice with Area, Perimeter and Circumference Sometimes we have to find area or perimeter of odd shapes. Find the area of the following shape. 15 m.
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The circumference of the circle is 50 feet. The area of the shaded region = ________ example 1 :
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The area of the circle is about 227 m 2. COURSE 2 LESSON 8-4 Find the area of the circle to the nearest unit. = (8.5) 2 Substitute 8.5 for the radius.
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Circumference & Area of Circles Unit 5-3. Circumference Formula for Circumference: ** r is the radius ** ** 2r = d. d is the diameter. ** **Circumference.
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AREA AND PERIMETER FORMULA TUTORIAL QUIZ. FORMULA MENU Area of Square Area of Square Area of a Circle Area of a Circle Radius of a Circle Radius.
Finding Areas of Shapes. Area of a Triangle Area of Triangle = 1 x Base x Vertical Height 2 Vertical Height Base Right Angle.
Perimeter Rectangles, Squares, and Triangles Perimeter Measures the distance around the edge of any flat object. To find the perimeter of any figure,
Prerequisite 12.0 OBJECTIVE: Solve for area of various quadrilaterals, triangles, and circles Solve for perimeter of irregular figures and circles.
Angles in Circles Angles on the circumference Angles from a diameter Angles at the centre & the circumference Cyclic quadrilaterals Tangents.
Do now: Work out the circumferences and areas of these circles 10 cm 12 cm 9 cm 2 cm 1.5 cm.
Our project is over finding area and perimeter of triangles circles rectangle and trapezoid.
$100 Area of Parallelograms Area of Triangles Perimeter And Area Area of Trapezoids Area of Compound Figures & Area and Circumference of Circles $200.
Unit 13 Areas Presentation 1Formula for Area Presentation 2Areas and Circumferences of Circles Presentation 3Formula for Areas of Trapeziums, Parallelograms.
CIRCLES CIRCUMFERENCE & AREA. CIRCUMFERENCE C = ΠdorC = 2Πr 12cm.
3.4 Area and Circumference 1 Circle A circle is a plane figure that consists of all points that lie the same distance from a fixed point. The fixed point.
Unit 10 Review Area Formulas. FOR EACH FIGURE: IMAGINE the shape THINK of its AREA FORMULA.
Chapter 10 Test Formula Review. Find the circumference of a circle with a diameter of 10. Identify the formula needed for the following questions.
March 8 th, Problem 1) A) What is the formula for the area of a circle? B) What is the formula for the circumference of a circle? C) How do these.
CIRCUMFERENCE OF A CIRCLE LEARNING TARGET 4: I CAN SOLVE PROBLEMS USING AREA AND CIRCUMFERENCE OF A CIRCLE.
written by Rob Oliver Score.
1 Tandi Clausen-May Teaching Maths to Pupils with Different Learning Styles London: Paul Chapman, 2005 Click the mouse. Click the mouse only when you seeClick.
Lesson Objectives 1.You will gain a deeper understanding of the fundamental concept of area of a circle. 2.You will understand how the formula for the.
Circumference & Area of a Circle. Definitions Circumference: The distance around a circle. Diameter (d): a line that passes through the center of a circle.
Radius, Diameter, and Circumference of a Circle Lesson 7 (3 rd 6 Weeks) TEKS 6.6C.
Circles. Parts of a Circle Center The diameter is the distance across the circle through the center The radius is the distance to the center point.
You can estimate the area of a circle by separating the circle into small triangles and then laying out those triangles so that they form a parallelogram.
10-7 Areas of Circles and Sectors Objective: To find the areas of circles, sectors and segments of circles.
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