Identifying and Solving Angles

Front

What does a right angle measure?

Back

90 degrees

Front

If the sum of the measures of two angles is 180°, what are these angles called?

Back

Supplementary

Front

What are vertical angles?

Back

Vertical angles are angles that are opposite each other when two lines intersect, and they are always congruent (equal measures).

Front

If m∠1 = 30°, what is m∠3 if they are vertical angles?

Back

30°

Front

When two lines intersect, what type of angles are formed that are opposite each other?

Back

Vertical angles

Front

What is the measure of a straight angle?

Back

180 degrees

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.

Front

What is the relationship between adjacent angles?

Back

Adjacent angles share a common side and a common vertex.

Front

What is the sum of the measures of angles in a triangle?

Back

180 degrees

Front

What are the properties of acute angles?

Back

Acute angles measure less than 90 degrees.