Use the correct formula to find the area of a circle if the diameter is 21 mi. Round to the nearest hundredth place. Use 3.14 for π.
65.94 mi. * 2
346.19 mi. * 2
131.88 mi. * 2
1,384.74 mi. * 2
The correct formula to find the area of a circle is A = πr^2 or A = (π/4)d^2, where d is the diameter of the circle, and r is the radius (r = d/2).
In this case, the diameter is 21 mi, so the radius is 10.5 mi.
Using the formula A = πr^2, we get:
A = 3.14 * 10.5^2
A = 346.185 mi^2
Rounding to the nearest hundredth place, the area of the circle is approximately 346.19 mi^2.
Therefore, the answer is: 346.19 mi. * 2