Question

1. 12) 13) radius = 5.2 ft c = 2π(5.2)=32.7 30.7 14) radius = 11.1 ft 15) radius = 9.5 in c = 2π(9.5)=59.7 16) radius = 9.3 in

Explanation:

Step1: Recall circle - circumference formula

The formula for the circumference of a circle is $C = 2\pi r$, where $r$ is the radius of the circle and $\pi\approx3.14$.

Step2: Solve for problem 11

Given $r = 4.2$ yd, then $C=2\times3.14\times4.2=26.376$ yd.

Step3: Solve for problem 12

Given $r = 6.2$ mi, then $C=2\times3.14\times6.2 = 38.936$ mi.

Step4: Solve for problem 13

Given $r = 5.2$ ft, then $C=2\times3.14\times5.2=32.656\approx32.7$ ft.

Step5: Solve for problem 14

Given $r = 11.1$ ft, then $C=2\times3.14\times11.1 = 69.708$ ft.

Step6: Solve for problem 15

Given $r = 9.5$ in, then $C=2\times3.14\times9.5=59.66\approx59.7$ in.

Step7: Solve for problem 16

Given $r = 9.3$ in, then $C=2\times3.14\times9.3=58.404$ in.

Answer:

1. $C = 26.376$ yd
2. $C = 38.936$ mi
3. $C\approx32.7$ ft
4. $C = 69.708$ ft
5. $C\approx59.7$ in
6. $C = 58.404$ in