He also collaborated with Wren on the design of St Paul's Cathedral; Hooke determined the ideal shape of an arch is definitely an inverted catenary and thence that a round series of these arches tends to make an ideal shape for the cathedral's dome.[109]بر پایه سرشماری عمومی نفوس و مسکن در سال ۱۳۹۵، جمعیت �