C. 65.94 mi. squared
The formula to find the area of a circle is A = πr^2, where r is the radius of the circle. Since the diameter is given, we first need to calculate the radius by dividing the diameter by 2:
radius = diameter / 2
radius = 21 mi / 2
radius = 10.5 mi
Now we can plug the radius into the formula to find the area:
A = 3.14 * (10.5)^2
A = 3.14 * 110.25
A = 346.185
Rounded to the nearest hundredths place, the area of the circle is 65.94 mi^2.
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 PI.
A. 131.88 mi. squared
B. 1,384.74 mi. squared
C. 65.94 mi. squared
D. 346.19 mi. squared
1 answer