Illuminations: IGD: Perpendicular Lines

IGD: Perpendicular Lines
Two lines are perpendicular if they meet at right angles.

Instructions
 
The two lines in the applet below are perpendicular. You can drag points A, B, or P to change the lines, but notice that the angle formed by the lines will always measure 90°.

Exploration
 

How Do You Construct Perpendicular Lines?

What Are Some Applications of Perpendicular Lines?


  

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Return to the IGD: Lines Overview.

NCTM Resources

Navigating through Geometry in 6‑8
National Council of Teachers of Mathematics Thinkfinity Verizon Foundation
More and Better Mathematics for All Students
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