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

Name a pair of vertical angles formed by intersecting lines.

Back

For example, if two lines intersect and form angles 1, 2, 3, and 4, then angles 1 and 4 are vertical angles.

Front

What are complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

Give an example of complementary angles.

Back

An example of complementary angles is 30° and 60°.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

Give an example of supplementary angles.

Back

An example of supplementary angles is 120° and 60°.

Front

What is the complement of a 45° angle?

Back

The complement of a 45° angle is 45° because 45° + 45° = 90°.

Front

If m∠A = 50°, what is m∠B if ∠A and ∠B are complementary?

Back

m∠B = 40° because 50° + 40° = 90°.

Front

If m∠C = 110°, what is m∠D if ∠C and ∠D are supplementary?

Back

m∠D = 70° because 110° + 70° = 180°.

Front

What is the relationship between adjacent angles?

Back

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