Question

What is the area of a circle with diameter 30 cm?

Answer 1

The area of the circle is `"706.9 cm"^2"`.

Explanation:

The formula for the area of a circle is:

`"Area"=pi*("radius")^2`,

`"radius"=1/2*"diameter"`

`"radius"=1/2*"30 cm"="15 cm"`

`A=pi*("15 cm")^2`

`A="706.9 cm"^2"`

I used the `pi` key on my calculator. If you don't have one, use `3.14159`.