Semicircular arch
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"Roman arch" redirects here. For the triumphal arches built in Rome, see Roman triumphal arch. For the concept in general relativity, see Roman arch (physics). For the racehorse, see Roman Arch.
Semicircular arch is an arch with intrados (inner surface) shaped like a semicircle.[1][2] This type of arch was adopted and very widely used by the Romans, thus becoming permanently associated with the Roman architecture.[3]