Angles

Front

What are complementary angles?

Back

Angles that add up to 90°.

Front

What are supplementary angles?

Back

Angles that add up to 180°.

Front

What is the measure of a right angle?

Back

90 degrees.

Front

What is the measure of a straight angle?

Back

180 degrees.

Front

What do you call an angle less than 90 degrees?

Back

Acute angle.

Front

What do you call an angle greater than 90 degrees but less than 180 degrees?

Back

Obtuse angle.

Front

What do you call angles that are equal to each other?

Back

Congruent angles.

Front

What is the sum of angles in a triangle?

Back

180 degrees.

Front

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

Back

60 degrees.

Front

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

Back

60 degrees.