Basic Angle Relationships

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 complementary angles?

Back

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

Front

What are supplementary angles?

Back

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

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 the measures of complementary angles?

Back

The sum of the measures of complementary angles is 90 degrees.

Front

What is the sum of the measures of supplementary angles?

Back

The sum of the measures of supplementary angles is 180 degrees.

Front

If one angle measures 30 degrees, what is the measure of its complementary angle?

Back

The measure of its complementary angle is 60 degrees (90 - 30 = 60).

Front

If one angle measures 120 degrees, what is the measure of its supplementary angle?

Back

The measure of its supplementary angle is 60 degrees (180 - 120 = 60).

Front

What is the relationship between two angles that are vertical?

Back

Vertical angles are equal in measure.

Front

If two angles are adjacent and one measures 45 degrees, what is the maximum measure the other angle can have if they are supplementary?

Back

The maximum measure the other angle can have is 135 degrees (180 - 45 = 135).