Question

I need help with area of a circle

A circular plate has a diameter of 6 inches.


What is the exact area of the plate?




A.3_ square inches



B.6_ square inches



C.36_ square inches



D.9_ square inches

Answer 1

D.

Explanation:

The area formula for a circle is
`A=\pi r^2`.

If the diameter is given, we take half of it to find the radius measure. If d = 6, then r = 3. Therefore, our formula can be filled in as

`A=\pi (3)^2` or
`A=9\pi`. That is the exact area. The approximate area is found by multiplying in 3.1415 as pi to give you that the area is approximately 28.27 square inches. I think you meant to put pi in those answer choices instead of an underscore, so it's my belief that D. is supposed to reflect the answer of
`9\pi` square inches. I'm going with D.