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
1,384.774 mi.2
131.88 mi.2
65.94 mi.2
346.19 mi.2
The correct formula to find the area of a circle is A = πr², where r is the radius of the circle.
Since the diameter is given as 21 mi, we can find the radius by dividing the diameter by 2:
r = 21/2 = 10.5 mi
Now we can substitute the value of the radius into the formula:
A = 3.14 * (10.5)² = 3.14 * 110.25 = 346.185
Rounding to the nearest hundredth, the area of the circle is approximately 346.19 mi.2
Therefore, the correct answer is 346.19 mi.2.