Angle Relationships

Front

What are vertical angles?

Back

Vertical angles are angles that are opposite each other when two lines intersect. They are always congruent (equal in measure).

Front

What is the sum of the measures of complementary angles?

Back

The sum of the measures of complementary angles is 90 degrees.

Front

What is the sum of the measures of supplementary angles?

Back

The sum of the measures of supplementary angles is 180 degrees.

Front

If angle A is 30 degrees, what is the measure of its complement?

Back

The measure of the complement of angle A is 60 degrees.

Front

If angle B is 120 degrees, what is the measure of its supplement?

Back

The measure of the supplement of angle B is 60 degrees.

Front

What are adjacent angles?

Back

Adjacent angles are two angles that share a common side and a common vertex but do not overlap.

Front

What is the relationship between angles 1 and 3 if they are vertical angles?

Back

Angles 1 and 3 are congruent (they have equal measures).

Front

If angle 2 measures 83 degrees, what is the measure of angle 3 if they are supplementary?

Back

The measure of angle 3 is 97 degrees.

Front

What is the measure of angle x if it is complementary to a 70-degree angle?

Back

The measure of angle x is 20 degrees.

Front

What type of angle pair are angles that add up to 180 degrees?

Back

Angles that add up to 180 degrees are called supplementary angles.