Perpendicular Lines – Quick Intro

How it works ?

1. In the applet below, the purple line and the brown line are said to be perpendicular lines.
2. Move the white points around a bit, then answer the question that appears below the applet.

3. Question:

   What does it mean for two lines to be perpendicular?

   Without looking up the definition on another tab in your browser, write a sentence definition in the response box below.

   Be specific in your description!