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Activity: Impossible Triangles
Go to: http://math.rice.edu/~lanius/Geom/Imposs/ (opens a new window)
Description: Figure out what makes each of the given triangles impossible. Which triangle property is violated?
Technology Type: Computer 
Author: Cynthia Lanius
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Triangles

  Dancing Queen
Comment:I think students would learn and remember the rules better if they discovered them, but I think this would be a great review exercise with a few additions.