Question

The surface area of a sphere is 5544 cm2. Find its diameter (in cm).

A) 42 B) 21 C) 84 D) 63

Answer 1

Answer:

We know,

Surface area of a sphere = 4 * π * r^2

=⟩ 5544 = 4 * 22/7 * (2*diameter)^2

=⟩ 5544 * 7 / 4 * 22 = (2*diameter)^2

=⟩ √7056 = 2*diameter

=⟩ 84/2 = diameter

=⟩ 42 cm = diameter

Hence, option (A) is correct.

Thanks...!!