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29 Proof Without Words

Author:Linda Bollman, Steve Phelps

Drag the points. Drag the slider. What do you notice? What does this prove? How does this prove?

Based on http://45.media.tumblr.com/9e608e03763922f7620fa7b21487f640/tumblr_nywxpgk6631uk13a5o1_500.gif

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