Question

Circumference: The radius of the earth is approximately 3,900 miles. Find the circumference of the earth at the equator. (The equator is a circle around the earth that divides the earth into two equal halves.) Use 3.14 for π π .

Answer 1

We know that circumference of a circle is simply equal to:

C = 2 π r

Therefore given the radius, we can directly solve:

C = 2 (3.14) * 3900 miles

C = 24,492 miles

The circumference is 24,492 miles