Vertical and Adjacent Angles

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal in measure.

Front

What are adjacent angles?

Back

Adjacent angles are two angles that share a common side and a common vertex but do not overlap.

Front

What is the sum of supplementary angles?

Back

The sum of supplementary angles is 180 degrees.

Front

What is the sum of complementary angles?

Back

The sum of complementary angles is 90 degrees.

Front

If m∠A = 45°, what is m∠B if A and B are complementary?

Back

m∠B = 45° (because 45° + 45° = 90°).

Front

If m∠C = 120°, what is m∠D if C and D are supplementary?

Back

m∠D = 60° (because 120° + 60° = 180°).

Front

What is the relationship between two angles that are both 90°?

Back

They are complementary angles.

Front

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

Back

They are equal in measure.

Front

What is the measure of an angle that is supplementary to a 70° angle?

Back

110° (because 70° + 110° = 180°).

Front

What is the measure of an angle that is complementary to a 30° angle?

Back

60° (because 30° + 60° = 90°).