Pythagoras Proof Without Words

[color=#ff0000][size=150]Drag the points in the sketch below.[br][/size][/color]
[color=#0000ff]What do you notice on dragging the points?[/color]
[color=#0000ff]What does this prove?[/color]
[color=#0000ff]How does this prove it?[/color]
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– Sangeeta Gulati, Steve Phelps

Information: Pythagoras Proof Without Words