Circles Vocab

Front

Circle:

Back

The locus of all points in a plane equidistant from a given point.

Front

Radius

Back

Segment with endpoints at the center and on the circle.

Front

Chord

Back

Segment with both endpoints on the circle.

Front

Diameter

Back

A chord that passes through the center of the circle.

Front

2r

Back

diameter

Front

2πr

Back

circumference

Front

Secant

Back

A line that intersects a circle at two points.

Front

tangent

Back

a line that intersects a circle at exactly one point

Front

πr²

Back

area

Front

Point of tangency

Back

The point where a tangent line touches a circle.