Special Angle Pairs

Front

What are supplementary angles?

Back

Two angles are supplementary if the sum of their measures is 180 degrees.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always congruent (equal in measure).

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 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 a linear pair of angles?

Back

A linear pair of angles is a pair of adjacent angles formed when two lines intersect. The angles in a linear pair are supplementary.

Front

What is the relationship between vertical angles?

Back

Vertical angles are always congruent, meaning they have equal measures.

Front

If two angles are complementary, what is their relationship?

Back

If two angles are complementary, their measures add up to 90 degrees.

Front

What is the measure of each angle in a pair of supplementary angles if one angle measures 70 degrees?

Back

The other angle measures 110 degrees (180 - 70 = 110).

Front

Identify a pair of vertical angles from the following: ∠COB and ∠AOD, ∠AOC and ∠BOD.

Back

∠COB and ∠AOD are a pair of vertical angles.

Front

What type of angles are formed when two lines intersect?

Back

When two lines intersect, they form vertical angles and adjacent angles.