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Tool: Finding What Doesn't Change
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Go to: http://illuminations.nctm.org/index_d.aspx?id=467 (opens a new window)
Description: Students will predict the effect of a rotation through a given angle and even the effect of two or more rotations performed one after the other and find angles that leave a figure unchanged.
Technology Type: Java Applet 
Author: NCTM: Illuminations
Language: English 
Cost: Does not require payment for use

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