Find the area of the circle if the diameter is 21mi. Round to the nearest hundredths place use 3.14
The radius of the circle is half of the diameter, so the radius is 21mi/2 = 10.5mi.
The formula for the area of a circle is A = πr^2, where r is the radius.
Substitute the radius into the formula:
A = 3.14 * (10.5mi)^2
A = 3.14 * 110.25
A = 346.185
Rounded to the nearest hundredths place, the area of the circle is 346.19 square miles.