Complementary, Supplementary, Vertical, and Linear Pairs

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always equal.

Front

What are linear pairs?

Back

A pair of adjacent angles formed when two lines intersect; they are supplementary.

Front

If one angle is 70°, what is its complementary angle?

Back

20°.

Front

If one angle is 120°, what is its supplementary angle?

Back

60°.

Front

If ∠A and ∠B are vertical angles, and ∠A = 40°, what is ∠B?

Back

40°.

Front

If two angles form a linear pair and one angle measures 110°, what is the measure of the other angle?

Back

70°.

Front

Identify the pairs of vertical angles: ∠COB & ∠COA, ∠AOD & ∠AOC, ∠COB & ∠AOD, ∠BOD & ∠AOD.

Back

∠COB & ∠AOD.

Front

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

Back

90 degrees.