 cycloidal arch

An arch that has a cycloidal shape, the diameter of the circle is half the span of the arch.
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Cycloid — For other uses, see Cycloid (disambiguation). A cycloid generated by a rolling circle A cycloid is the curve traced by a point on the rim of a circular wheel as the wheel rolls along a straight line. It is an example of a roulette, a curve… … Wikipedia
Cavalieri's principle — Two stacks of coins with the same volume In geometry, Cavalieri s principle, sometimes called the method of indivisibles, named after Bonaventura Cavalieri, is as follows:[1] 2 dimensional case: Suppose two regions in a plane are included between … Wikipedia
List of architectural vaults — The following is a list of arched structures known in architecture as vaults.* Ambulatory vault – the covered portion of the covered passage around a cloister. Often written in the context of an ambulatory vault mosaic. * Annular vault – A Barrel … Wikipedia