# How do you find the circumference and area of a circle with diameter of 18 inches?

##### 1 Answer

Sep 29, 2015

Circumference =

#### Explanation:

We use the following formulas:

First step is finding the radius. As I mentioned above, the radius is half the diameter, or in this case, half of 18. So, our radius is 9 inches. Now we can apply our formulas; we'll start with circumference:

For area: