Parallel, Perpendicular, and Intersecting Lines

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 are perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Front

What are intersecting lines?

Back

Intersecting lines are lines that cross each other at any angle.

Front

If two lines are parallel, what can be said about their slopes?

Back

If two lines are parallel, their slopes are equal.

Front

If two lines are perpendicular, what is the relationship between their slopes?

Back

If two lines are perpendicular, the product of their slopes is -1.

Front

What symbol is used to denote parallel lines?

Back

Front

What symbol is used to denote perpendicular lines?

Back

Front

Can two lines be both parallel and intersecting?

Back

No, two lines cannot be both parallel and intersecting. If they are parallel, they will never meet.

Front

What is an example of parallel lines in real life?

Back

Examples of parallel lines in real life include railway tracks and the edges of a ruler.

Front

What is an example of perpendicular lines in real life?

Back

Examples of perpendicular lines in real life include the corners of a square or the intersection of streets.