Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

Lines that never intersect and have the same slope.

Front

What are perpendicular lines?

Back

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

Front

If two lines have slopes that are opposite reciprocals, what type of lines are they?

Back

Perpendicular lines.

Front

What is the slope of parallel lines?

Back

The same slope.

Front

What is the slope of perpendicular lines?

Back

Opposite reciprocals.

Front

If line A has a slope of 2, what is the slope of a line parallel to it?

Back

2.

Front

If line B has a slope of -1/3, what is the slope of a line perpendicular to it?

Back

3.

Front

What does it mean for two lines to intersect?

Back

They cross each other at one point.

Front

Which of the following pairs of slopes indicate parallel lines: 3 and 3, 2 and -1/2, 1/4 and 1/4?

Back

3 and 3, 1/4 and 1/4.

Front

What is the relationship between the slopes of two lines that are neither parallel nor perpendicular?

Back

They do not have a specific relationship.