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.
65.94 mi.2
346.19 mi
1,384.74 mi
131.88 mi
The formula for the area of a circle is A = πr^2, where r is the radius of the circle. We can use the diameter to find the radius since the radius is half the diameter.
r = d/2 = 21/2 = 10.5 mi
Now we can substitute this value of r in the formula
A = π(10.5)^2 = 346.36 mi^2 (rounded to the nearest hundredths)
Therefore, the correct option is 346.36 mi^2.