Use the correct formula to defined the area of a circle if the diameter is 21 mi round to the nearest hundreds place use 3.14 for tt
131.88 mi ²
65.94 mi ²
346.19 mi ²
1384.74 mi ²
The correct formula to calculate the area of a circle is A = πr².
Given that the diameter of the circle is 21 miles, we can find the radius (r) by dividing the diameter by 2:
r = 21/2 = 10.5 miles
Now, we can substitute the value of r into the formula:
A = 3.14(10.5)² = 3.14(110.25) = 346.185 mi²
Rounding to the nearest hundreds place, the area of the circle is 346.19 mi².
Therefore, the correct answer is:
346.19 mi ²