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.
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
1 answer