Question

AB is a radius of the circle. The length of AB is 18. Find the
circumference of the circle.

Answer 1

Circumference of circle formula:

C=2πr, where r=radius and 2r=diameter

Let’s plug in the radius: r=18

C=2π(18)

C=113.1

So, the circumference of the circle is 113.1 (which is rounded to the nearest tenth).