Parallel Lines and Transversals

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet and are always the same distance apart.

Front

What is a transversal?

Back

A transversal is a line that intersects two or more lines at different points.

Front

What are corresponding angles?

Back

Corresponding angles are angles that are in the same position on two parallel lines cut by a transversal.

Front

What are alternate interior angles?

Back

Alternate interior angles are angles that lie between two parallel lines on opposite sides of a transversal.

Front

What are consecutive interior angles?

Back

Consecutive interior angles are angles that lie on the same side of the transversal and inside the two parallel lines.

Front

What is the relationship between supplementary angles?

Back

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

Front

If two angles are supplementary and one angle measures 60 degrees, what is the measure of the other angle?

Back

The other angle measures 120 degrees.

Front

What is the value of x if angle 1 and angle 2 are vertical angles?

Back

Vertical angles are equal, so x = the measure of angle 1.

Front

How do you find the measure of an angle formed by a transversal?

Back

Use the properties of corresponding, alternate interior, or consecutive interior angles to find the measure.

Front

What is the sum of the interior angles of a triangle?

Back

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