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

If angle A is 53 degrees, what is the measure of its complementary angle?

Back

The complementary angle is 37 degrees.

Front

If angle B is 90 degrees, what is the measure of its supplementary angle?

Back

The supplementary angle is 90 degrees.

Front

What is the relationship between angles 1 and 3 if they are vertical angles?

Back

Angles 1 and 3 are equal in measure.

Front

If two angles are adjacent and one measures 40 degrees, what is the measure of the other angle if they are supplementary?

Back

The other angle measures 140 degrees.

Front

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

Back

The sum is 90 degrees.

Front

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

Back

The sum is 180 degrees.