parallel lines and transversals

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 crosses at least two other lines in the same plane.

Front

What are corresponding angles?

Back

Corresponding angles are pairs of angles that are in similar positions at each intersection where a transversal crosses two lines.

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that lie between two lines and on opposite sides of a transversal.

Front

What are alternate exterior angles?

Back

Alternate exterior angles are pairs of angles that lie outside two lines and on opposite sides of a transversal.

Front

What are consecutive interior angles?

Back

Consecutive interior angles are pairs of angles that lie between two lines on the same side of a transversal.

Front

If two parallel lines are cut by a transversal, what can be said about the corresponding angles?

Back

Corresponding angles are congruent.

Front

If angle 1 is 50°, what is the measure of angle 5 if lines are parallel?

Back

Angle 5 is also 50° because corresponding angles are congruent.

Front

If angle 3 is 130°, what is the measure of angle 2 if lines are parallel?

Back

Angle 2 is also 130° because alternate exterior angles are congruent.

Front

What is the sum of the measures of consecutive interior angles when lines are parallel?

Back

The sum of the measures of consecutive interior angles is 180°.