Angle Relationships

Front

What is an adjacent angle?

Back

An adjacent angle is an angle that is next to another angle and shares a common side.

Front

What does it mean for two angles to be supplementary?

Back

Two angles are supplementary if 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. They are always equal in measure.

Front

How do you find the measure of an unknown angle when given supplementary angles?

Back

To find the measure of an unknown angle that is supplementary to a known angle, subtract the known angle's measure from 180 degrees.

Front

What is the relationship between adjacent angles?

Back

Adjacent angles share a common vertex and a common side but do not overlap.

Front

If angle 5 is 150 degrees, what is the measure of the angle adjacent and supplementary to it?

Back

The adjacent angle would measure 30 degrees, since 180 - 150 = 30.

Front

What is the sum of the measures of angles in a triangle?

Back

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

Front

How can you identify vertical angles in a diagram?

Back

Vertical angles can be identified as the angles that are opposite each other at the intersection of two lines.

Front

What is the measure of an angle if it is complementary to a 45-degree angle?

Back

The measure of the angle would be 45 degrees, since complementary angles sum to 90 degrees.

Front

What is the definition of complementary angles?

Back

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