# ISEE Upper Level Math : How to find the ratio of diameter and circumference

## Example Questions

### Example Question #1 : How To Find The Ratio Of Diameter And Circumference

A circle has a radius of . What is the ratio of the diameter to the circumference?

Explanation:

The information about the radius is unnecessary to the problem. The equation of the circumference is:

Therefore, the circumference is times larger than the diameter, and the ratio of the diameter to the circumference is:

### Example Question #2 : Diameter

A circle has a radius of . What is the ratio of the diameter to the circumference?