Angle Relationships

Front

What is the sum of the interior angles of a triangle?

Back

180 degrees

Front

If two angles are congruent, what does that mean?

Back

They have the same measure.

Front

What is the measure of a right angle?

Back

90 degrees

Front

What do we call angles that add up to 90 degrees?

Back

Complementary angles.

Front

What do we call angles that add up to 180 degrees?

Back

Supplementary angles.

Front

If angle A measures 40 degrees, what is the measure of its complement?

Back

50 degrees

Front

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

Back

60 degrees

Front

What is the relationship between vertical angles?

Back

Vertical angles are congruent.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An angle that measures more than 90 degrees but less than 180 degrees.