Vertical angles

Front

What are vertical angles?

Back

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

Front

If two angles are vertical angles, what is true about their measures?

Back

Vertical angles are always equal in measure.

Front

How can you find the measure of an angle if you know the measure of its vertical angle?

Back

You can find the measure of the angle by knowing that it is equal to its vertical angle.

Front

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

Back

Adjacent angles are supplementary, meaning their measures add up to 180 degrees.

Front

If angle A measures 55 degrees, what is the measure of its vertical angle?

Back

The measure of the vertical angle is also 55 degrees.

Front

If angle B is 31 degrees, what is the measure of the angle adjacent to it?

Back

The adjacent angle would measure 149 degrees, since 31 + 149 = 180.

Front

What is the sum of the measures of two vertical angles?

Back

The sum of the measures of two vertical angles is always equal to 360 degrees.

Front

How do you solve for an unknown angle in a pair of vertical angles?

Back

Set the unknown angle equal to the known vertical angle and solve for the variable.

Front

What is the formula for finding the measure of an angle when given a linear pair?

Back

The formula is: Measure of angle 1 + Measure of angle 2 = 180 degrees.

Front

If angle C is 9 degrees, what is the measure of its vertical angle?

Back

The measure of the vertical angle is also 9 degrees.