Chords Arcs Central and Inscribed Angles

Front

What is a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.

Front

What is the definition of a diameter?

Back

A diameter is a chord that passes through the center of the circle.

Front

What is an arc in a circle?

Back

An arc is a portion of the circumference of a circle.

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.

Front

What is an inscribed angle?

Back

An inscribed angle is an angle whose vertex is on the circle and whose sides are chords of the circle.

Front

What is the relationship between an inscribed angle and the arc it intercepts?

Back

The measure of an inscribed angle is half the measure of the intercepted arc.

Front

What is a major arc?

Back

A major arc is an arc that measures more than 180 degrees.

Front

What is a minor arc?

Back

A minor arc is an arc that measures less than 180 degrees.

Front

What is a semi-circle?

Back

A semi-circle is an arc whose measure is half of a circle (180 degrees).

Front

How do you calculate the measure of an arc?

Back

The measure of an arc can be calculated based on the central angle that intercepts it.