Parallel Lines Cut by a Transversal

Front

What is the definition of 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 at each intersection where a transversal crosses two lines.

Front

What is the relationship between alternate interior angles when two parallel lines are cut by a transversal?

Back

Alternate interior angles are equal when two parallel lines are cut by a transversal.

Front

What are same-side interior angles?

Back

Same-side interior angles are pairs of angles on the same side of the transversal and between the two lines.

Front

What is the relationship between same-side interior angles when two parallel lines are cut by a transversal?

Back

Same-side interior angles are supplementary when two parallel lines are cut by a transversal.

Front

What are vertical angles?

Back

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

Front

What does it mean for angles to be supplementary?

Back

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

Front

If angle 4 measures 70 degrees, what is the measure of angle 6 if they are same-side interior angles?

Back

Angle 6 measures 110 degrees.

Front

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

Back

Subtract the measure of the known angle from 180 degrees.