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The "inverted arch" is used when a sideways, or inward load, is to be resisted. The "common arch" supports a vertical load.
false the arch was created by the romans
pyongyang triumphal arch
* The Drop arch - a blunt pointed arch drawn from two centers within the span* The Gothic arch - a pointed arch; usually has a joint (instead of a keystone) at the apex* The Keel arch, ogee arch - a pointed arch having an S-shape on both sides* The Trefoil arch - a pointed arch having cusps in the intrados on either side of the apex
The plural form for the noun arch is arches.