Question

What is the surface area of a sphere with a radius of 3 centimeters?

Answer 1

The equation for the surface area of a sphere is
`A=4 \pi r^(2)`

So plug in 3 cm for radius "r"


`A=4 \pi ( 3cm)^(2)`

Simplify

`A=4 \pi (9 cm^(2))`

`A=36 \pi cm^(2)`

Depending on your teacher, they might want you to leave it like this or plug in 3.14 for
`\pi`
So your answer is either

`A=36 \pi cm^(2)`
or

`A=113.04 cm^(2)`