Angle Basics Identification

Front

What are vertical angles?

Back

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

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 are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

What are complementary angles?

Back

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

Front

What is a linear pair of angles?

Back

A linear pair of angles consists of two adjacent angles that form a straight line, adding up to 180 degrees.

Front

If ∠A and ∠B are supplementary, what is the relationship between their measures?

Back

The sum of the measures of ∠A and ∠B is 180 degrees.

Front

If ∠C and ∠D are vertical angles, what can be said about their measures?

Back

The measures of ∠C and ∠D are equal.

Front

Identify a pair of adjacent angles in the following: ∠AOB and ∠BOC.

Back

∠AOB and ∠BOC are adjacent angles because they share a common side (OB) and a common vertex (O).

Front

What is the measure of each angle in a pair of complementary angles if one angle measures 30 degrees?

Back

The other angle measures 60 degrees, since 30 + 60 = 90 degrees.

Front

What is the sum of the measures of two angles that form a linear pair?

Back

The sum of the measures of two angles that form a linear pair is 180 degrees.