Module 2 Lesson 1 - Angles and Congruence

Front

What is an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

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

What is a linear pair of angles?

Back

A linear pair of angles consists of two adjacent angles formed when two lines intersect. They are supplementary.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always congruent.

Front

How do you find the measure of an angle in a linear pair?

Back

To find the measure of an angle in a linear pair, subtract the measure of the known angle from 180 degrees.

Front

What is the vertex of an angle?

Back

The vertex of an angle is the point where the two rays meet.

Front

If angle A measures 72 degrees, what is the measure of its supplementary angle?

Back

The supplementary angle measures 108 degrees (180 - 72 = 108).

Front

If angle B measures 83 degrees, what is the measure of its complementary angle?

Back

The complementary angle measures 7 degrees (90 - 83 = 7).

Front

What is the relationship between vertical angles?

Back

Vertical angles are congruent, meaning they have equal measures.