Flashcard 3.1Parallel Lines, Transversals & Perpendicular Lines

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 other lines at different points.

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

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines cross. They are always equal.

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.

Front

What is the relationship between parallel lines and corresponding angles?

Back

When two parallel lines are cut by a transversal, the corresponding angles are equal.

Front

What is the relationship between parallel lines and alternate interior angles?

Back

When two parallel lines are cut by a transversal, the alternate interior angles are equal.

Front

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

Back

When two parallel lines are cut by a transversal, the same-side interior angles are supplementary (add up to 180 degrees).

Front

If m∠1 = 60°, what is m∠4 if lines are parallel?

Back

m∠4 = 120° (because they are supplementary angles).