Question

What is the radius of a sphere if its surface area is 2,122.64 square inches? (Use 3.14 for π.)



11 in.

13 in.

121 in.

169 in.

Answer 1

Well, I just used the previous formula that we had, and then I just went down the multiple choice list.

Answer 2

4 times pi times a multiple choice option, so is it:\[4 \times \pi \times 11\]\[4 \times \pi \times 13\]\[4 \times \pi \times 121\]\[4 \times \pi \times169\]

Answer 3

where did u get 11,13,121?

Answer 4

They're multiple choice options...

Answer 5

ohhhh okay

Answer 6

\[13^{2}=169\]\[169\times3.14=530.66\]\[530.66\times4=?\]

Answer 7

2122.64 @OrangeMaster

Answer 8

Yes, so the answer is 13