Central and Inscribed Angles

Front

What is a central angle?

Back

An angle in a circle with its vertex at the center of the circle.

Front

What is an inscribed angle?

Back

An angle in a circle with its vertex on the circle itself.

Front

If m∠PRQ = 51°, what is the measure of the angle?

Back

51°

Front

Which segment is a radius?

Back

A radius is a segment that connects the center of the circle to any point on the circle.

Front

What is a chord in a circle?

Back

A chord is a segment whose endpoints lie on the circle.

Front

What is the relationship between a central angle and an inscribed angle that subtend the same arc?

Back

The measure of the inscribed angle is half the measure of the central angle.

Front

What is the diameter of a circle?

Back

A diameter is a chord that passes through the center of the circle and has endpoints on the circle.

Front

What is a secant line?

Back

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

Front

What is a tangent line?

Back

A tangent line is a line that touches a circle at exactly one point.

Front

How do you find the measure of an inscribed angle?

Back

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