Circle Vocabulary

Front

What is an Inscribed Angle?

Back

An Inscribed Angle is 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 Minor Arc?

Back

A Minor Arc is the shorter arc connecting two points on a circle. It is less than 180 degrees.

Front

What is a Secant?

Back

A Secant is a line that intersects a circle at two points.

Front

What is a Central Angle?

Back

A Central Angle is an angle whose vertex is at the center of the circle and whose sides are radii that extend to the circle.

Front

What is a Radius?

Back

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

Front

What is a Diameter?

Back

A Diameter is a line segment that passes through the center of the circle and has its endpoints on the circle. It is twice the length of the radius.

Front

What is a Chord?

Back

A Chord is a line segment whose endpoints lie on the circle.

Front

What is a Major Arc?

Back

A Major Arc is the longer arc connecting two points on a circle. It is greater than 180 degrees.

Front

What is the Circumference of a Circle?

Back

The Circumference is the distance around the circle, calculated as C = 2πr, where r is the radius.

Front

What is the relationship between a Central Angle and an Inscribed Angle?

Back

The measure of an Inscribed Angle is half the measure of the Central Angle that subtends the same arc.