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Perpendicular Lines - Quick Intro

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

Perpendicular Lines


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!