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.
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
1 answer
1 answer