Use the correct formula to find the area of a circle if the diameter is 21 mi. Round to the nearest hundredths place. Use 3.14 for .
(1 point)
The formula for the area of a circle is A = πr², where r is the radius of the circle.
Since the diameter is given, we first need to find the radius by dividing the diameter by 2:
radius = diameter/2 = 21 mi / 2 = 10.5 mi
Now we can substitute the radius into the formula:
A = 3.14 x (10.5)^2
A = 3.14 x 110.25
A ≈ 346.19 mi²
Therefore, the area of the circle is approximately 346.19 square miles.