Question

What is the area of a donut that is approximately 4 inches in diameter?

Answer 1

Hello,

I am assuming the donut does not have a hole in this situation.

If so, this problem is simply finding the area of a circle, given the diameter.

The formula for the area of a circle is:
π
`r^(2)`

In this formula, r is the radius of the circle, which is 1/2 of the diameter of the circle. So, the radius is 1/2 of 4 inches which is (1/2)(4) = 2 inches.

So, we use the formula and our calculated radius to find the area of the donut.

π
`r^(2)` = π
`( 2)^(2)` = 4π ≈ 12.57 inches.

The area of the donut is 12.57 inches. Hope this helps!