Basic Angle Relationships

Front

What are complementary angles?

Back

Complementary angles are two angles that add up to 90 degrees.

Front

What are supplementary angles?

Back

Supplementary angles are two angles that add up to 180 degrees.

Front

What are vertical angles?

Back

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

Front

What are adjacent angles?

Back

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

Front

What is a linear pair of angles?

Back

A linear pair of angles are two adjacent angles that form a straight line, adding up to 180 degrees.

Front

If one angle is 30 degrees, what is its complementary angle?

Back

The complementary angle is 60 degrees, since 30 + 60 = 90.

Front

If two angles are supplementary and one angle is 110 degrees, what is the other angle?

Back

The other angle is 70 degrees, since 110 + 70 = 180.

Front

What is the measure of vertical angles?

Back

Vertical angles have the same angle measure.

Front

If angle A is 40 degrees, what is the measure of angle B if they are complementary?

Back

Angle B is 50 degrees, since 40 + 50 = 90.

Front

What is the relationship between adjacent angles?

Back

Adjacent angles share a common vertex and a common side.