Angle Relationships

Front

What are complementary angles?

Back

Angles that add up to 90°.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

If angle ∠ABD is 67°, what is the measure of ∠DBC if they are complementary?

Back

23°.

Front

What is the relationship between congruent angles?

Back

Congruent angles have the same measure.

Front

Which angles are considered vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

What are supplementary angles?

Back

Angles that add up to 180°.

Front

How can you identify complementary angles in a diagram?

Back

Look for two angles that together form a right angle (90°).

Front

What is the sum of the measures of two complementary angles?

Back

90°.

Front

What is the sum of the measures of two supplementary angles?

Back

180°.

Front

If two angles are vertical, what can be said about their measures?

Back

They are equal.