Parallel Lines cut by a Transversal

Front

What are parallel lines?

Back

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

Front

What is a transversal?

Back

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

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and inside the two lines.

Front

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

Back

They are equal.

Front

What are same-side interior angles?

Back

Angles that are on the same side of the transversal and inside the two lines.

Front

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

Back

They are supplementary (add up to 180 degrees).

Front

What is a linear pair of angles?

Back

Two adjacent angles that form a straight line and add up to 180 degrees.

Front

If angle 1 and angle 2 are a linear pair, what is the relationship between them?

Back

Angle 1 + Angle 2 = 180 degrees.

Front

If angle 2 is 70 degrees, what is the measure of angle 1 if they are alternate interior angles?

Back

Angle 1 = 70 degrees.

Front

If angle 2 is 70 degrees and angle 1 is a same-side interior angle, what is the measure of angle 1?

Back

Angle 1 = 110 degrees.