Question

Can you please help me out with a question

Answer 1

`s1=4\cdot\pi\cdot r1^2=\text{ 4}\cdot\pi\cdot2^2=16\cdot\pi`
`s2=4\cdot\pi\cdot r2^2=4\cdot\pi\cdot7^2=196\cdot\pi`
`(r1)/(r2)=(2)/(7)`