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by jcaS1+S3=[OEA]+[OHA]+[OFC]+[OGC]=[OEB]+[OHD]+[OFB]+[OGD]=[OEB]+[OFB]+[OHD]+[OGD]=S2+S4
Join each of the vertices of ABCD to O and the result is obvious
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by jca
ReplyDeleteS1+S3=[OEA]+[OHA]+[OFC]+[OGC]=[OEB]+[OHD]+[OFB]+[OGD]=[OEB]+[OFB]+[OHD]+[OGD]=S2+S4
Join each of the vertices of ABCD to O and the result is obvious
ReplyDelete