Circle Parts

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, and the sides of the angle are the chords.

Front

What is a Major Arc?

Back

A Major Arc is an arc that is larger than a semicircle. It is defined by two endpoints on the circle and includes the longer path between those points.

Front

What is a Tangent?

Back

A Tangent is a line that touches a circle at exactly one point. It is perpendicular to the radius drawn to the point of contact.

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 Semi Circle?

Back

A Semi Circle is half of a circle, formed by a diameter and the arc connecting the endpoints of the diameter.

Front

What is a Minor Arc?

Back

A Minor Arc is an arc that is smaller than a semicircle. It is defined by two endpoints on the circle and includes the shorter path between those points.

Front

What is a Chord?

Back

A Chord is a line segment whose endpoints lie on the circle. It does not pass through the center of the circle.

Front

What is a Secant?

Back

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

Front

What is a Sector?

Back

A Sector is a region of a circle bounded by two radii and the arc between them.

Front

What is the relationship between Inscribed Angles and Central Angles?

Back

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