Circles and Arc Measures

Front

What is the relationship between the measure of a central angle and the measure of its intercepted arc?

Back

The measure of a central angle is equal to the measure of its intercepted arc.

Front

What is the measure of a central angle that intercepts a semicircle?

Back

180 degrees.

Front

If the measure of an arc is 120 degrees, what is the measure of its central angle?

Back

120 degrees.

Front

What is the measure of an arc that is formed by a 90-degree central angle?

Back

90 degrees.

Front

If the measure of an arc is 360 degrees, what can you say about its intercepted chord?

Back

The intercepted chord is the diameter of the circle.

Front

Define a central angle in a circle.

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides intersect the circle.

Front

What is an arc in a circle?

Back

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

Front

How do you calculate the measure of a minor arc?

Back

The measure of a minor arc is equal to the measure of the central angle that intercepts it.

Front

What is the difference between a minor arc and a major arc?

Back

A minor arc is less than 180 degrees, while a major arc is greater than 180 degrees.

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where r is the radius of the circle.