Question

Find the radius!

Surface Area = 1,139.82 yd?
radius =
13 yd
O
12 yd
O 11yd
O
10 yd

Answer 1

11 yd

Explanation:

SA = 3
`\pi`r²

1139.82 = 3 × 22/7 × r²

r² = 1139.82/66 × 7

r² = 120.81

r = 10.99 = 11 yd

Answer 2

10

Explanation:

A=4πr^2

r=√(A/4π)

r=√(1139.82/4π)

r=9.5=10 yd