Math Homework. Do It Faster, Learn It Better.


In a plane, a circle is the set of all points equidistant from a given point called the center. You can name a circle by its center. Circle P ( P ) is shown.

A radius is a segment that has one endpoint at the center and the other endpoint on the circle. In the circle P , P C is the radius. P A and P B are also radii.

A diameter is a segment that contains the center of a circle and has both endpoints on the circle. In the circle P , A B is a diameter.