Use the correct formula to find the area of a circle if the diameter is 21 mi. Round to the nearest hundredths place
To find the area of a circle, you would use the formula A = πr^2, where r is the radius of the circle. Since the diameter is given in this case, you can find the radius by dividing the diameter by 2.
Given: Diameter = 21 mi
Radius = 21 mi / 2 = 10.5 mi
Now, plug the radius into the formula:
A = π(10.5)^2
A ≈ 3.14159 * (10.5)^2
A ≈ 3.14159 * 110.25
A ≈ 346.36065
Rounded to the nearest hundredths place, the area of the circle is approximately 346.36 square miles.