What is the diameter of a circle?

Understand the Problem

The question is asking for the definition or value of the diameter of a circle, which is a basic concept in geometry. The diameter is the longest distance across the circle, passing through the center, and it is twice the radius.

More Information

The diameter is the longest straight line that can be drawn through the center of the circle, touching two points on its boundary.

Tips

A common mistake is confusing the radius with the diameter. Remember, the diameter is always twice the radius.

Sources

• Geometry and the Circle - mathsisfun.com
• Circle Definition (Illustrated Mathematics Dictionary) - Math is Fun - mathisfun.com