Basic Geometry Terms

Front

Circumference

Back

The distance around the edge of a circle.

Front

Radius

Back

The distance from the center of a circle to any point on its circumference.

Front

Pi

Back

A mathematical constant approximately equal to 3.14159, used to calculate the circumference and area of a circle.

Front

Diameter

Back

The distance across a circle through its center, equal to twice the radius.

Front

Area of a Circle

Back

The space contained within the circumference of a circle, calculated as π times the square of the radius (A = πr²).