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.

Front

What is a transversal?

Back

A transversal is a line that crosses at least two other lines.

Front

What are corresponding angles?

Back

Corresponding angles are angles that are in the same position on two parallel lines cut by a transversal.

Front

What is the relationship between alternate interior angles?

Back

Alternate interior angles are equal when two parallel lines are cut by a transversal.

Front

What are same-side interior angles?

Back

Same-side interior angles are on the same side of the transversal and between the two lines.

Front

What is the relationship between same-side interior angles?

Back

Same-side interior angles are supplementary when two parallel lines are cut by a transversal.

Front

If ∠1 = 70°, what is the measure of ∠2 if they are corresponding angles?

Back

∠2 = 70° (corresponding angles are equal).

Front

If ∠3 = 45°, what is the measure of ∠4 if they are alternate interior angles?

Back

∠4 = 45° (alternate interior angles are equal).

Front

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

Back

The angles formed have specific relationships: corresponding angles are equal, alternate interior angles are equal, and same-side interior angles are supplementary.

Front

What is the sum of the measures of same-side interior angles?

Back

The sum of the measures of same-side interior angles is 180°.