# Parallel & Perpendicular Lines

- Author:
- David DeShetler, Tim Brzezinski

- Topic:
- Straight Lines

## PARALLEL LINES

The following applet demonstrates a property that parallel lines have when they're drawn in the coordinate plane.

*Be sure to move the***blue points**around quite a bit!## QUESTION 1

If you move the blue points to make the lines vertical, are the lines consider parallel?

What can you conclude about parallel lines drawn in the coordinate plane?

## PERPENDICULAR LINES

This applet demonstrates a property that perpendicular lines have when they're drawn in the coordinate plane.

*Be sure to move the points around quite a bit and observe carefully as you do!*What can you conclude about perpendicular lines that are drawn in the coordinate plane? (Assume the lines are not aligned horizontally and vertically).