Question

The radius of a circle is 20 in. Find its circumference in terms of π

Answer 1

C = 40π

Explanation:

To calculate the circumference of a circle, we will use the formula

C = 2πr

And we're asked to find C in terms of pi.

So all I need to do is plug in 20 for the radius, and then multiply.

I plug in 20 for the radius, r: C = 2π × 20

Multiply: C = 40π

Therefore, C = 40π.

Answer 2

40π inches

Explanation:

What is the formula for the circumference of a circle?

The formula for the circumference of a circle is:

• C = 2πr

(where C is the circumference and r is the radius)

If the radius of the circle is 20 inches, then its circumference in terms of π would be:

• C = 2π × 20 = 40π inches

Therefore, the circumference of a circle when the radius is 20in is 40π inches.