Question

The radius of a semicircle is 4 miles. What is the semicircle's area?

Answer 1

8
`\pi` miles or 25.133 miles

Explanation:

your radius is 4 miles.

The area of a circle is A=
`\pi r^(2)`

Therefore, the area of this circle is
`4^(2) \pi`, or 16
`\pi`

Half of this area, because what you're looking for is a semi-circle, is:

8
`\pi` (exact) or 25.133 (rounded) miles.