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 corresponding angles.

Back

Corresponding angles are pairs of angles that are in similar positions at each intersection where a transversal crosses two lines.

Front

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

Back

When two parallel lines are cut by a transversal, corresponding angles are equal.

Front

What are vertical angles?

Back

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

Front

What is the relationship between vertical angles?

Back

Vertical angles are always equal to each other.

Front

How do you find the measure of an unknown angle when given the measures of other angles?

Back

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

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 sum of angles around a point?

Back

The sum of angles around a point is 360°.

Front

If m∠1 = 30°, what is m∠3 if ∠1 and ∠3 are corresponding angles?

Back

m∠3 = 30° because corresponding angles are equal.