Parallel Line Geometry

Front

What is the definition of parallel lines?

Back

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

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°.

Front

What is a supplementary angle?

Back

Supplementary angles are two angles whose sum is 180°.

Front

If one angle measures 45°, what is its supplementary angle?

Back

135°

Front

What is the definition of 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

If angle 1 is 110°, what is the measure of angle 2 if they are corresponding angles?

Back

110°

Front

What is the definition of alternate interior angles?

Back

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

Front

If angle 3 is 70°, what is the measure of angle 4 if they are alternate interior angles?

Back

70°

Front

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

Back

The corresponding angles are equal, and the alternate interior angles are equal.