Angle Addition Review

Front

What is the Angle Addition Postulate?

Back

The Angle Addition Postulate states that if point D is in the interior of ∠ABC, then m∠ABD + m∠DBC = m∠ABC.

Front

What are the sides of an angle?

Back

The sides of an angle are the rays that form the angle. For example, in ∠ABC, the sides are ray AB and ray AC.

Front

How do you find the measure of an angle when given two adjacent angles?

Back

To find the measure of an angle formed by two adjacent angles, use the Angle Addition Postulate: m∠ABD + m∠DBC = m∠ABC.

Front

What is the definition of a ray?

Back

A ray is a part of a line that starts at a point and extends infinitely in one direction.

Front

What is the difference between an angle and a straight angle?

Back

An angle is formed by two rays with a common endpoint, while a straight angle measures 180 degrees and is formed by two rays that point in opposite directions.

Front

If m∠JKL = 80°, what is the measure of its complement?

Back

The measure of the complement of an angle is found by subtracting the angle from 90°. Therefore, the complement of 80° is 10°.

Front

What is the definition of congruent angles?

Back

Congruent angles are angles that have the same measure.

Front

What is another name for ∠H if it is formed by rays HG and HK?

Back

Another name for ∠H could be ∠KHG or ∠GHK.

Front

How do you name an angle using its vertex?

Back

An angle can be named using its vertex and a point on each side. For example, ∠ABC uses vertex B.

Front

What is the measure of an angle if it is supplementary to a 50° angle?

Back

The measure of an angle that is supplementary to a 50° angle is 130°, since supplementary angles add up to 180°.