Right Angle
Definition

A right angle is an angle with a measure of 90°.

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Real World Examples
http://www.clipart.com_Filename:040501_1952_2470_a__s.thb.jpg http://www.clipart.com_Filename:19282610.jpg http://www.clipart.com_Filename:020425_1463_0113_l__p.thb.jpg
Demonstration
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