Question

7. The radii of two spheres are in the ratio 2:5. Find the ratio between their
surface areas.​

Answer 1

Step-by-step explanation:

For a sphere, surface area is 4•pi•r²

Thus Area is proportional to r²

Thus the ratio between two spheres' Area is

= r1² / r2²

= (r1/r2)²

= (2/5)²

= 4/25