Diameter From Radius

Diameter from Radius

The diameter of a circle is the distance across the circle through the center. The radius goes from the center to the circle. These two measurements are directly related:

diameter = 2 × radius

Method

1. Identify the radius given in the problem.
2. Multiply by 2 to find the diameter.
3. Simplify the result if needed.

Example pattern

If the radius is 7, then the diameter is:

2 × 7 = 14

So the diameter is 14.

Check your answer

A quick check is to divide your diameter by 2. You should get the original radius. If not, recheck the multiplication and any simplification.

Common mistake to avoid

Do not add 2 to the radius. The diameter is found by multiplying the radius by 2, not by adding.

When answers are exact, keep fractions or whole numbers in their simplest form before submitting.