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Garfields bevis for Pythagoras' læresætning

Den tidligere amerikanske præsident James Garfield lavede et bevis for Pythagoras' læresætning. Han bruge et trapez til at lave to identiske retvinklede trekanter og et halvt kvadrat, som blev brugt til at vise, at summen kvadratet på trekantens to korte sider er lig kvadratet på den lange side. Lavet af Sal Khan.

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