Vertical angles

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

If two lines intersect and one angle measures 59°, what is the measure of the vertical angle?

Back

59°.

Front

If one angle is 45°, what is the measure of its vertical angle?

Back

45°.

Front

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

Back

180°.

Front

If one angle measures 135°, what is the measure of its vertical angle?

Back

135°.

Front

If two angles are vertical angles, what can we say about their measures?

Back

They are equal.

Front

If one angle measures 72°, what is the measure of its vertical angle?

Back

72°.

Front

What is the relationship between vertical angles and adjacent angles?

Back

Vertical angles are not adjacent; they are opposite each other.

Front

If two intersecting lines create angles of 108° and x, what is the value of x?

Back

72°.