7-1 & 7-2

Front

What is an adjacent angle?

Back

An angle that is next to another angle and shares a common side.

Front

What does it mean for angles to be supplementary?

Back

Two angles are supplementary if their measures 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 congruent.

Front

What does it mean for angles to be congruent?

Back

Angles that have the same measure are called congruent angles.

Front

What are complementary angles?

Back

Two angles are complementary if their measures add up to 90 degrees.

Front

Give an example of complementary angles.

Back

81° and 9° are complementary angles because 81° + 9° = 90°.

Front

What is the sum of the measures of supplementary angles?

Back

The sum is always 180 degrees.

Front

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

Back

∠COB & ∠AOD are vertical angles.

Front

What is the measure of an angle that is supplementary to 70°?

Back

The measure is 110° because 70° + 110° = 180°.

Front

What is the measure of an angle that is complementary to 20°?

Back

The measure is 70° because 20° + 70° = 90°.