Angle Basics Identification

Front

What are vertical angles?

Back

Vertical angles are pairs of opposite angles formed when two lines intersect. They are always congruent (equal in measure).

Front

What is the sum of complementary angles?

Back

Complementary angles always add up to 90 degrees.

Front

What is the sum of supplementary angles?

Back

Supplementary angles always add up to 180 degrees.

Front

Identify vertical angles in the following: ∠8 and ∠5, ∠8 and ∠6, ∠8 and ∠7.

Back

The vertical angles are ∠8 and ∠5.

Front

What is the relationship between adjacent angles?

Back

Adjacent angles share a common side and vertex but do not overlap.

Front

What are congruent angles?

Back

Congruent angles are angles that have the same measure.

Front

If two angles are complementary and one angle measures 30 degrees, what is the measure of the other angle?

Back

The other angle measures 60 degrees (90 - 30 = 60).

Front

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

Back

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

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.