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

Define adjacent angles.

Back

Angles that share a common side and a common vertex but do not overlap.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always equal.

Front

What are corresponding angles?

Back

Angles that are in the same position on two parallel lines in relation to a transversal.

Front

What are alternate interior angles?

Back

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

Front

What are consecutive interior angles?

Back

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

Front

What is the relationship between supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What is the relationship between complementary angles?

Back

Two angles that add up to 90 degrees.

Front

If ∠1 and ∠2 are corresponding angles, what can be said about their measures?

Back

If the lines are parallel, then ∠1 = ∠2.