## anonymous 3 years ago What is the area of a circle with a diameter that is 20 inches long? Round your answer to the nearest tenth.

1. anonymous

The formula is radius^2 * pi Since you only have the diameter you divide that by 2 since the radius is half the diameter Now you have the radius which is 10in long. Simply plug that into the formula to get: 10^2 * pi = 100pi or 314.2

2. anonymous

$A = \pi r^{2}$ $radius = \frac{ diameter }{ 2 } = 10$ $A = \pi (10^{2}) = 100]\pi$

3. anonymous

Thanks!