Geo2.2 Proving Lines Parallel-

Front

What condition proves that line l is parallel to line m?

Back

If ∠3 ≅ ∠5, then line l is parallel to line m.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always congruent.

Front

What is the relationship between the slopes of parallel lines?

Back

The slopes of parallel lines are the same.

Front

What are alternate interior angles?

Back

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

Front

How can you identify corresponding angles?

Back

Corresponding angles are in the same position on two parallel lines in relation to a transversal.

Front

What is the definition of parallel lines?

Back

Parallel lines are lines in a plane that never meet and are always the same distance apart.

Front

What is the Alternate Interior Angles Theorem?

Back

If a transversal intersects two parallel lines, then each pair of alternate interior angles is congruent.

Front

What is the Corresponding Angles Postulate?

Back

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

Front

What is the definition of a transversal?

Back

A transversal is a line that intersects two or more lines at different points.

Front

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

Back

Same-side interior angles are supplementary when the lines are parallel.