Arc Measures

Front

What is an arc in a circle?

Back

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

Front

How is the measure of an arc defined?

Back

The measure of an arc is defined by the central angle that subtends the arc.

Front

What is the relationship between the central angle and the arc length?

Back

The arc length is directly proportional to the central angle; as the angle increases, the arc length increases.

Front

What is a minor arc?

Back

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

Front

What is a major arc?

Back

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

Front

What is a semicircle?

Back

A semicircle is an arc that measures exactly 180 degrees.

Front

How do you calculate the length of an arc?

Back

Arc length = (central angle/360) x (2πr), where r is the radius.

Front

What is the formula for finding the measure of an inscribed angle?

Back

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

Front

What is the relationship between inscribed angles that intercept the same arc?

Back

Inscribed angles that intercept the same arc are congruent.

Front

What is a chord in a circle?

Back

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