29 Proof Without Words

Drag the points. Drag the slider.[br]What do you notice? What does this prove? How does this prove?
Based on [url]http://45.media.tumblr.com/9e608e03763922f7620fa7b21487f640/tumblr_nywxpgk6631uk13a5o1_500.gif[/url]
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– Linda Bollman, Steve Phelps

Information: 29 Proof Without Words