Angles and Angle Relationships

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 does it mean if two angles are neither complementary nor supplementary?

Back

It means that the sum of their measures is not equal to 90 degrees or 180 degrees.

Front

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

Back

60 degrees (90 - 30 = 60).

Front

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

Back

60 degrees (180 - 120 = 60).

Front

What is the sum of the measures of angles in a triangle?

Back

The sum of the measures of angles in a triangle is always 180 degrees.

Front

If angle C measures 45 degrees, what are the measures of the other two angles in a right triangle?

Back

The other two angles must add up to 135 degrees.

Front

What is a vertical angle?

Back

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

Front

If m∠MRT equals 133 degrees, what is m∠MRN if they are supplementary?

Back

m∠MRN equals 47 degrees (180 - 133 = 47).

Front

What is an adjacent angle?

Back

Adjacent angles are two angles that share a common side and a common vertex.