The circumference of a circle is 70.7 m. Find its radius. Use the rules for working with measurements.
A) The radius is 4.74 m.
B) The radius is 11.3 m.
C) The radius is 5.63 m.
D) The radius is 22.5 m.
E) The radius is 45.0 m.

Question

Quizplus · Accepted Answer

The formula for the circumference of a circle is C = 2πr, where C is the circumference of the circle and r is its radius.

In this case, we know that C = 70.7 m, so we can plug that value into the formula:

70.7 = 2πr

To solve for r, we can divide both sides by 2π:

r = 70.7 / (2π)

Using a calculator, we get:
r ≈ 11.25

Therefore, the best choice is B, which is closest to 11.25.

The Circumference of a Circle Is 70