Parallel Lines and Triangles

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. When it intersects parallel lines, it creates several angles.

Front

Define alternate interior angles.

Back

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

Front

What are corresponding angles?

Back

Corresponding angles are pairs of angles that are on the same side of the transversal and in corresponding positions relative to the parallel lines.

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 parallel lines.

Front

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

Back

Alternate interior angles are equal.

Front

If angle 1 is 108 degrees, what is the measure of angle 7 if angle 7 is an alternate interior angle?

Back

Angle 7 is 108 degrees.

Front

If angle 2 = 57 degrees, what is the measure of angle 3 if angle 3 is an alternate interior angle?

Back

Angle 3 is also 57 degrees.

Front

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

Back

Corresponding angles are equal.

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 degrees.