Question

A circle has a radius of 9 cm. What is its circumference?

Use 3.14 for n, and do not round your answer. Be sure to include the correct unit in your answer.
0
9 cm

Answer 1

56.52 cm

Explanation:

Concepts

The circumference of a circle is the distance around it, or the perimeter of the circle. The formula to find the circumference is 2πr, where r = radius.

Application

We're given the radius as 9 cm, and we have to find the circumference of the circle using π as 3.14. Let's use the formula 2πr to solve for this.

Solution

• 
  `(2)(3.14)(9)`
• 
  `(6.28)(9)`
• 
  `56.52`