Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

Lines that never meet and are always the same distance apart.

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees).

Front

What is a horizontal line?

Back

A line that goes from left to right and is parallel to the horizon.

Front

What is a vertical line?

Back

A line that goes up and down and is perpendicular to horizontal lines.

Front

If two lines cross each other at a right angle, what type of lines are they?

Back

Perpendicular Lines.

Front

If two lines never meet, what type of lines are they?

Back

Parallel Lines.

Front

What is the angle formed by perpendicular lines?

Back

90 degrees.

Front

Can parallel lines be curved?

Back

No, parallel lines are straight and never meet.

Front

In a coordinate plane, what is the slope of a vertical line?

Back

Undefined.

Front

In a coordinate plane, what is the slope of a horizontal line?

Back

0.