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He also collaborated with Wren on the look of St Paul's Cathedral; Hooke identified the ideal shape of an arch is an inverted catenary and thence that a round number of these types of arches tends to make an ideal form for that cathedral's dome.[109]«نتایج سرشماری عمومی نفوس و مسکن ۱۳۸۵». درگاه ملی آمار �