How do you figure out diameter?

Answer 1

Assuming you are talking about a circle:* If you know the radius of the circle, multiply that by 2.

* If you know the circumference of the circle, divide that by pi.

* If you know nothing, you need to measure either the radius, the diameter, or the circumference.

Answer 2

To calculate diameter, measure from one side of a circle to the other. This measurement is called the diameter.

Answer 3

The answer depends on what you want to figure about the diameter and also on what information you do have.