Question

If the surface area of two spheres are in ratio 9:16 then find the ratio of their radii.

Answer 1

Surface area of 1st sphere
--------------------------------------- =
Surface area of 2nd sphere


4×π×r1×r1
---------------
4×π×r2×r2


9 r1square
--- = ------------
16 r2square

On square rooting,

3 r1
--- = ---
4 r2


r1:r2 = 3:4

Answer 2

hope it helps............