Circle Vocabulary

Front

What is an Inscribed Angle?

Back

An angle formed by two chords in a circle which have a common endpoint. The vertex of the angle is on the circle.

Front

What is a Chord?

Back

A line segment with both endpoints on the circle.

Front

What is a Minor Arc?

Back

An arc that is smaller than a semicircle, defined by two endpoints on the circle.

Front

What is a Major Arc?

Back

An arc that is larger than a semicircle, defined by two endpoints on the circle.

Front

What is a Semi-Circle?

Back

An arc that represents half of a circle, formed by a diameter.

Front

What is a Central Angle?

Back

An angle whose vertex is at the center of the circle and whose sides are radii.

Front

What is a Diameter?

Back

A chord that passes through the center of the circle, equal to twice the radius.

Front

What is a Radius?

Back

A line segment from the center of the circle to any point on the circle.

Front

What is a Tangent Line?

Back

A line that touches the circle at exactly one point.

Front

What is a Secant Line?

Back

A line that intersects the circle at two points.