Question

A sphere has a diameter of 12 ft. What is the surface area of the sphere? Express the answer in terms of pi.

Recall the formula SA=4 pi r^2.


pi ft^2

Answer 1

the answer is 144 pi^2

Answer 2

Answer:

$SA=144\pi\ ft^2$

Step-by-step explanation:

We know that the diameter of the sphere is 12 feet.

By definition the radius of the sphere is:

$r =\frac{d}{2}$

Where d is the diameter of the sphere

Then

$r =\frac{12}{2}$

$r =6\ ft$

Now we calculate the surface area of the sphere using the formula

$SA=4\pi r^2$

$SA=4\pi (6)^2$

$SA=4\pi(36)$

$SA=144\pi\ ft^2$