9.0 - Circle Basics

Front

Circle

Back

All points that are a fixed distance from the same point.

Front

Radius

Back

Straight line from the center to any point on the circle.

Front

Arc

Back

Part of a circle connecting two points.

Front

Minor Arc

Back

Arc whose measure is less than 180 degrees.

Only use two letters to name.

Front

Chord

Back

Segment whose endpoints lie on the circle.

Front

Major Arc

Back

Arc whose measure is greater than 180 degrees.

Use three letters to name.

Front

Diameter

Back

Straight line passing from side to side through the center of the circle.

Front

Semi Circle

Back

Arc whose endpoints form a diameter.

Equal to 180 degrees.

Front

Tangent

Back

Line that touches the circle at exactly one point, called the point of tangency.

Front

Central Angle

Back

An angle whose vertex is at the center of a circle.