Complementary, Supplementary, and Vertical Angles

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always congruent.

Front

If angle A is 30 degrees, what is its complementary angle?

Back

60 degrees.

Front

If angle B is 110 degrees, what is its supplementary angle?

Back

70 degrees.

Front

What is the relationship between vertical angles?

Back

Vertical angles are always equal in measure.

Front

If two angles are supplementary and one angle measures 120 degrees, what is the measure of the other angle?

Back

60 degrees.

Front

If angle C is 45 degrees, what is the measure of its complementary angle?

Back

45 degrees.

Front

If angle D is 90 degrees, what is its supplementary angle?

Back

90 degrees.

Front

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

Back

90 degrees.