Question

A sphere has a radius of 5 ft.

What is the surface area of the sphere?

A. 33π

B. 100π

C. 40π

D. 150π

Answer 1

B. 100π

Explanation:

Given :-

Radius of sphere :- 5 ft.

We need to find surface area of sphere.

let's solve.

First we use formula

Surface Area of sphere :- 4πr²

And we have give radius that is 5.

let's put the value of radius in formula.

Surface Area of sphere :- 4 × π × ( 5 )²

Now , solve these we will get.

surface Area of sphere = 4 × π × 25

multiply both numbers

Hence, We get

Surface Area of sphere :- 100 π

Therefore option B. 100π is correct.

Answer 2

B. 100π

Explanation:

The surface area of a sphere is given by

SA = 4 pi r^2

The radius is 5

SA = 4 * pi * r^2

SA = 4 * pi * 25

SA = 100 pi