Question

Find the area of a circle with a radius of 21 inches.

Answer 1

1384.74 inches.

Explanation:

The formula for area of a circle is:

`a=\pi *r^2(3.14*radius*radius)`

`\pi =3.14, r=radius.`

According to the word problem, the radius of the circle is 21 inches.

Now, we can just plug the numbers into the formula.

`\pi *21^2(3.14*21*21)=1384.74`

Therefore, the area of the circle is 1384.74 inches.

Answer 2

A≈1385.44in²

Explanation:

A=πr2=π·212≈1385.44236in²