Angle Relationship (Missing Angles)

Front

What are complementary angles?

Back

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

Front

What are vertical angles?

Back

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

Front

How do you find the measure of an angle if you know its complementary angle?

Back

Subtract the measure of the known angle from 90 degrees.

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

If two angles are supplementary, what is their relationship?

Back

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

Front

How do you find the missing angle in a linear pair?

Back

Subtract the measure of one angle from 180 degrees.

Front

What is the value of x if angle 1 is 50 degrees and angle 2 is complementary to angle 1?

Back

x = 40 degrees.

Front

If angle 3 is 130 degrees, what is the measure of its vertical angle?

Back

The vertical angle is also 130 degrees.

Front

What is the relationship between angles formed by two intersecting lines?

Back

The angles formed are pairs of vertical angles and adjacent angles.

Front

How do you solve for an unknown angle in a triangle if you know the other two angles?

Back

Subtract the sum of the known angles from 180 degrees.