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สำเนาของ Proof Without Words

Autor:นิภาวรรณ มหาวรรณ์, Steve Phelps
Drage the points. Drag the slider. What does this prove? How does this prove?
Based on http://45.media.tumblr.com/9e608e03763922f7620fa7b21487f640/tumblr_nywxpgk6631uk13a5o1_500.gif

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