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 π.
A. 65.94 mi.2
B. 346.19 mi.2
C. 1,384.74 mi.2
D. 131.88 mi.2
The correct formula to find the area of a circle is: A = πr^2, where r is the radius of the circle.
We are given the diameter, which is 21 mi. The radius is half the diameter, so:
r = 21/2 = 10.5 mi
Now we can use the formula and substitute in the values:
A = 3.14 * 10.5^2 = 346.185 mi.2
Rounding to the nearest hundredths place, we get:
A ≈ 346.19 mi.2
Therefore, the answer is B. 346.19 mi.2.