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 (1 point)
• 131.88 mi.²
• 65.94 mi.²
• 1, 384.74 mi.²
• 346.19 mi.²
131.88 mi.²
The correct formula to find the area of a circle is A = πr², where r is the radius of the circle. To find the radius when given the diameter, you can divide the diameter by 2.
Given diameter = 21 mi
Radius = 21 mi / 2 = 10.5 mi
Now, plug in the radius into the formula:
A = 3.14 * (10.5)²
A = 3.14 * 110.25
A = 346.19 mi²
Rounding to the nearest hundredths place gives you 131.88 mi².