Question

The ratio of the surface area of two spherical balls of radii 3 cm and 4 cm = .

• A. 9:16
• B. 27:64
• C. 3:4
• D. 9:64

Answer 1

The correct option is A 9:16

The surface area of a sphere =$4\pi r^2$
Hence, the required ratio = $\frac{4\pi (3{)}^2}{4\pi (4{)}^2}$ = $\frac{9}{16}$.