Parallel Lines

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 is the Corresponding Angles Postulate?

Back

If two parallel lines are cut by a transversal, then each pair of corresponding angles is equal.

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 Alternate Interior Angles Theorem?

Back

If two parallel lines are cut by a transversal, then each pair of alternate interior angles is equal.

Front

What are Consecutive Interior Angles?

Back

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

Front

What is the Consecutive Interior Angles Theorem?

Back

If two parallel lines are cut by a transversal, then each pair of consecutive interior angles is supplementary.

Front

What are Vertical Angles?

Back

Angles that are opposite each other when two lines intersect.

Front

What is the Vertical Angles Theorem?

Back

Vertical angles are always equal.

Front

If angle 1 = 43°, what is the measure of angle 2 if lines are parallel?

Back

Angle 2 = 43° (Corresponding angles are equal).