Question

If the radius of a sphere is doubled, what is the ratio of the surface area of the first sphere to that of the second sphere?

Answer 1

Answer : 1:4

Step by step Explanation:

Let the radius be r

So the surface area of first sphere be 4πr^2

If it is doubled, the new radius = 2r

new surface area = 4π (2r)^2

Ratio = 4πr^2/4π4r^2

= 1/4

= 1:4