Parallel Lines

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 the relationship between corresponding angles when two parallel lines are cut by a transversal?

Back

Corresponding angles are equal.

Front

Define vertical angles.

Back

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

Front

What are same-side interior angles?

Back

Same-side interior angles are pairs of angles on the same side of the transversal and inside the two lines. They are supplementary when the lines are parallel.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles on opposite sides of the transversal but inside the two lines. They are equal when the lines are parallel.

Front

What is the definition of supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

What is the definition of congruent angles?

Back

Congruent angles are angles that have the same measure.

Front

How can you identify if two lines are parallel using angle relationships?

Back

If a transversal intersects two lines and the corresponding angles are equal, then the lines are parallel.

Front

What is the relationship between exterior angles and interior angles in a triangle?

Back

An exterior angle of a triangle is equal to the sum of the two opposite interior angles.