Question

Find the radius of each circle

Answer 1

5= 12.4/2=6.2

6 radius=20.8/2 =10.4

7. radius = 10.2/2=5.1

8.radius =16/2=8

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Answer 2

5. 6.2 yd

6. 10.4 ft

7. 5.1 mi

8. 8 yd

9. 75.40 m

10. 69.12 m

Explanation:

• to find the radius, divide the diameter (which is given) by 2

5 — 12.4 / 2 = 6.2 yd

6 — 20.8 / 2 = 10.4 ft

7 — 10.2 / 2 = 5.1 mi

8 — 16 / 2 = 8 yd

• to find the circumference of the circle, you can use this formula: C = 2πr

9 — 2π(12) = 75.3982236862 = 75.40 m

10 — 2π(11) = 69.115038379 = 69.12 m