Circle Vocabulary Flashcards

Front

Circle

Back

A closed, curved shape where all points are equally distant from the center.

Front

Radius

Back

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

Front

Diameter

Back

The distance across a circle through its center (equal to 2 × radius).

Front

Circumference

Back

The distance around the outside of a circle (similar to perimeter).

Front

Pi (π)

Back

A special number (approximately 3.14) representing the ratio of the circumference to the diameter of any circle.

Front

Area

Back

The amount of space inside a circle.

Front

Chord

Back

A line segment connecting two points on a circle (may or may not pass through the center).

Front

Arc

Back

A portion of the circumference of a circle.

Front

Center

Back

The exact middle point of a circle.