Question

What is the circumference of a circle with a radius of 13 centimeters?

Answer 1

`c = 26pi` or `c approx 81.68`

Explanation:

The formula for finding the circumference of a circle is:

`c = pid`

Thus, the only variable we really need to convert is the radius. We know that the formula for converting radius to diameter is:

`2r = d`

Finally, all we need to do is plug in the values:

`c = pid`
= `c = pi * 26`
= `c approx 81.68`

All the best!