Angle Relationships

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 equal in measure.

Front

What are adjacent angles?

Back

Two angles that share a common side and a common vertex.

Front

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

Back

60 degrees.

Front

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

Back

60 degrees.

Front

If two angles are complementary, and one angle measures 40 degrees, what is the measure of the other angle?

Back

50 degrees.

Front

If angle C is 83 degrees, what is the measure of the angle that is vertical to it?

Back

83 degrees.

Front

Identify the relationship: If angle D and angle E are both 45 degrees, what can be said about them?

Back

They are complementary angles.

Front

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

Back

180 degrees.