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    Name national geom_0140 (Необходимое и достаточно условие перпендикулярности диагоналей выпуклого 4-х угольника)
    Name international geom_0140
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    Source of objectCreated by the viewed user
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    Date of creation07 May 2015 Year 22H:20M:04S
    Date of update17 February 2019 Year 23H:46M:22S

    All heirs together [ geom_0140 (Необходимое и достаточно условие перпендикулярности диагоналей выпуклого 4-х угольника) geom_0140 ]
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