Parallel Lines cut by a Transversal

Front

What are parallel lines?

Back

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

Front

What is a transversal?

Back

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

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that are on opposite sides of the transversal and inside the two lines. They are equal when the lines are parallel.

Front

What are same-side interior angles?

Back

Same-side interior angles are pairs of angles that are on the same side of the transversal and inside the two lines. They are supplementary when the lines are parallel.

Front

What is a linear pair?

Back

A linear pair is a pair of adjacent angles formed when two lines intersect. The angles in a linear pair are supplementary, meaning they add up to 180 degrees.

Front

Back

Front

Back

A and B are supplementary angles.

Front

What is the relationship between same-side interior angles when lines are parallel?

Back

Same-side interior angles are supplementary, meaning their measures add up to 180 degrees.

Front

Back

Front

What is the measure of the larger angle formed at the intersection of a transversal and parallel lines if one angle measures 48 degrees?

Back

The larger angle measures 132 degrees (180 - 48 = 132).