12.3 Warm-up Missing Angles and Equations

Front

What is the value of x if the angle measures 118 degrees?

Back

x = 118

Front

Find the missing angle x if the angle measures 20 degrees.

Back

x = 20°

Front

Complementary angles always add up to what?

Back

90 degrees

Front

Supplementary angles always add up to what?

Back

180 degrees

Front

What type of angles are adjacent angles?

Back

Adjacent angles are angles that share a common side and vertex.

Front

If two angles are complementary, what is the relationship between their measures?

Back

The sum of their measures is 90 degrees.

Front

If two angles are supplementary, what is the relationship between their measures?

Back

The sum of their measures is 180 degrees.

Front

What are vertical angles?

Back

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

Front

What is a linear pair of angles?

Back

A linear pair of angles are two adjacent angles that form a straight line.

Front

If one angle measures 70 degrees, what is the measure of its complementary angle?

Back

The complementary angle measures 20 degrees.