He also collaborated with Wren on the design of St Paul's Cathedral; Hooke determined the ideal condition of the arch is undoubtedly an inverted catenary and thence that a round number of this sort of arches would make a really perfect condition with the cathedral's dome.[109] Micrographia also contains Hooke's, https://raymond566a1.wikisona.com/1268399/هوک_can_be_fun_for_anyone