=平方差在勾股定律中的应用=

        插图1

        如图所示：

        eg垂直于ac垂足是点g

        ei垂直于ad垂足是点i

        cf垂直于ab垂足是点f

        df垂直于ab垂足是点f

        fh垂直于bc垂足是点h

        fj垂直于bd垂足是点j

        bc=ce=de=bd

        cf=df

        fj=fh

        ei=eg

        ai=ag

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