Flashcard 9: Vertical and Linear Pair Angles

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

What are linear pair angles?

Back

Linear pair angles are two adjacent angles formed when two lines intersect. The sum of their measures is always 180 degrees.

Front

If two angles are vertical angles, what can we say about their measures?

Back

If two angles are vertical angles, their measures are equal.

Front

If two angles form a linear pair, what can we say about their measures?

Back

If two angles form a linear pair, the sum of their measures is 180 degrees.

Front

Find the value of x if the angles are a linear pair and one angle measures 125 degrees.

Back

x = 55 degrees.

Front

Find the value of x if the angles are vertical angles and one angle measures 57 degrees.

Back

x = 57 degrees.

Front

Are the angles 45 degrees and 135 degrees vertical angles, a linear pair, or neither?

Back

They are a linear pair.

Front

Are the angles 90 degrees and 90 degrees vertical angles, a linear pair, or neither?

Back

They are vertical angles.

Front

What is the relationship between the measures of two angles that are vertical angles?

Back

The measures of two vertical angles are equal.

Front

What is the relationship between the measures of two angles that are a linear pair?

Back

The measures of two angles that are a linear pair add up to 180 degrees.