Parallel Lines Flashcard Part1

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 exterior angles.

Back

Alternate exterior angles are pairs of angles that are on opposite sides of the transversal and outside the two lines. They are equal when the lines are parallel.

Front

Define corresponding angles.

Back

Corresponding angles are pairs of angles that are in the same position on two different lines cut by a transversal. They are equal when the lines are parallel.

Front

What are vertical angles?

Back

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

Front

If m∠1 = 30°, what is m∠3 if lines are parallel?

Back

m∠3 = 30° (because ∠1 and ∠3 are corresponding angles).

Front

What is the sum of angles on a straight line?

Back

The sum of angles on a straight line is 180°.

Front

What is the relationship between alternate interior angles?

Back

Alternate interior angles are equal when the lines are parallel.

Front

How do you find the measure of an unknown angle when given a pair of angles?

Back

Use the properties of angles (e.g., supplementary, complementary, or equal) to set up an equation and solve for the unknown angle.

Front

What is the measure of angle 4 if angle 8 is 70°?

Back

Angle 4 = 70° (because angle 4 and angle 8 are corresponding angles).