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Circles

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Circles

1. 1. Circumference & Area
2. 2. Parts of a Circle d = 2r and diameter 1 r= d 2 radius
3. 3. Circumference (Distance around a circle) 8 in. π = 3.14 4 in.C= π d or C=2π rC = 3.14(8) C = 2(3.14)(4)C = 25.12 in. C = 25.12 in
4. 4. Give it a try!1. If the diameter is 10 feet, what is the radius?2. If the radius is 3.2 inches, what is the diameter?3. Find the circumference: 15 cm 3 mm4. Find the circumference:
5. 5. Give it a try!1. If the diameter is 10 feet, what is the radius? r = 5 feet2. If the radius is 3.2 inches, what is the diameter? d = 6.4 in.3. Find the circumference: 15 cmC = 3.14 x 15 = 47.1 cm4.Find the circumference: 3 mmC = 2 x 3.14 x 3 = 18.84 mm
6. 6. Area of a Circle (The inside of the circle) 3m d = 10 in 10 in π r = 5 inA= πr 2 2 A= πr) A = 3.14(5 2 2A = 3.14(3 ) 2A = 28.26 m 2 A = 78.5 in
7. 7. You try!7 in 20 ft. A= πr 2
8. 8. You try! 20 ft. 7 in d = 20, so r = π π 2A= r 10 2 2A = 3.14(7 ) A= r2 2 2A = 153.86 in A = 3.14(10 ) A = 314 ft
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