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Circles

Circles. Circumference. diameter. radius. Area. Circumference. A = π r 2. C = π d. M May. Calculate the circumference and area of the circle radius 5 cm. C = π d. r = 5. d = 10. C = 3.14 x 10. 5. C = 31.4. So the circumference is 31.4 cm. A = π r 2. r = 5. A = 3.14 x 5 x 5.

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Circles

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  1. Circles Circumference diameter radius Area Circumference A = π r2 C = π d M May

  2. Calculate the circumference and area of the circle radius 5 cm. C = π d r = 5 d = 10 C = 3.14 x 10 5 C = 31.4 So the circumference is 31.4 cm A = π r2 r = 5 A = 3.14 x 5 x 5 A = 78.5 So the area is 78.5 cm2 M May

  3. x 360 x 360 x 360 x 360 Arcs and Sectors sector x˚ arc arc length Sector area C = A = π d = π r 2 = M May

  4. Calculate the length of each of these arcs: r = 5 m b 60˚ a d = 20 cm r = 7.8 m 160˚ c M May

  5. Calculate the length of each of these arcs: r = 5 m b 60˚ a d = 10m d = 20 cm 60 b = Arc C 90 360 a = Arc C 360 1 b = π x d 1 6 a = π x d 4 1 b = 3.14 x 10 1 6 a = 3.14 x 20 4 5.23 m b = 15.70 cm a = M May

  6. r = 7.8 m 160˚ c Calculate the length of each of these arcs: 160 Arc c = C 360 16 c = π d 36 d = 15.6 m 4 c = x 3.14 x 15.6 9 3.14 x 15.6 x 4 ÷ 9 c = 21.8 m = 21.770666 M May

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