What is the area of a circle with a diameter of 10 millimeters? Estimate the area to the tenths place using 3.14 for π.(1 point.)

15.7 square mm
79 square mm
78.5 square mm
314 square mm

1 answer

The area of a circle can be found using the formula A = πr^2, where π is approximately 3.14 and r is the radius of the circle. In this case, the diameter is given as 10 mm, so the radius would be half of that, which is 5 mm.

Using the formula, we can calculate the area:

A = 3.14 * (5)^2
A = 3.14 * 25
A ≈ 78.5 square mm

Therefore, the estimated area of the circle is 78.5 square mm.