Vertical Angles and Linear Pairs

Front

What are vertical angles?

Back

Angles that are opposite of each other when lines intersect.

Front

Vertical angles are always:

Back

congruent (equal measures).

Front

Name a pair of angles that form a linear pair.

Back

Angles 9 and 10.

Front

If m∠1 = 30°, then m∠3 = ?

Back

30°.

Front

What is a linear pair of angles?

Back

Two adjacent angles that form a straight line and add up to 180°.

Front

What is the relationship between vertical angles?

Back

Vertical angles are always equal in measure.

Front

If two angles are supplementary, what is their sum?

Back

180°.

Front

What are adjacent angles?

Back

Angles that share a common side and vertex.

Front

If m∠A + m∠B = 180°, what can we say about angles A and B?

Back

They are supplementary angles.

Front

What is the measure of vertical angles if one angle is 70°?

Back

70°.