Angle Relationships

Front

What is the definition of complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What is the definition of supplementary angles?

Back

Supplementary angles are two angles whose 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 equal.

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

If ∠A and ∠B are complementary, what is the measure of ∠B if ∠A is 30 degrees?

Back

∠B = 90 - 30 = 60 degrees.

Front

If ∠1 and ∠2 are supplementary and ∠1 measures 110 degrees, what is the measure of ∠2?

Back

∠2 = 180 - 110 = 70 degrees.

Front

What is the relationship between ∠AOB and ∠COB if they share a common vertex and side?

Back

They are adjacent angles.

Front

If two angles are vertical angles, what can be said about their measures?

Back

Vertical angles are equal in measure.

Front

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

Back

The sum is 90 degrees.

Front

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

Back

The sum is 180 degrees.