Unit 2 Lesson 03 Angle Pairs

Front

What are vertical angles?

Back

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

Front

What is the definition of 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 consists of two adjacent angles whose non-common sides form a straight line. The sum of their measures is 180 degrees.

Front

What are complementary angles?

Back

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

Front

What are supplementary angles?

Back

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

Front

How do you identify vertical angles in a diagram?

Back

Vertical angles are formed by two intersecting lines and are located opposite each other. They can be identified by looking for pairs of angles that do not share a side.

Front

If angle A measures 40 degrees, what is the measure of its complement?

Back

The measure of the complement of angle A is 50 degrees, since 90 - 40 = 50.

Front

If angle B measures 120 degrees, what is the measure of its supplement?

Back

The measure of the supplement of angle B is 60 degrees, since 180 - 120 = 60.

Front

What is the relationship between angles in a linear pair?

Back

The angles in a linear pair are supplementary, meaning their measures add up to 180 degrees.

Front

Identify a pair of adjacent angles in the following: ∠CXD and ∠DXE.

Back

∠CXD and ∠DXE are adjacent angles because they share a common vertex (point D) and a common side (line segment CXD).