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An arch is a curved structure that spans an opening and supports loads from above. It works by transferring weight along its curve to supporting structures, such as columns or walls, at each end.

Arches have been widely used in architecture for thousands of years and are a key feature in Roman, Gothic, and Islamic architecture. They are commonly used in bridges, doorways, windows, and large structural openings.

Different types of arches include semicircular arches, pointed arches, and segmental arches, each offering different aesthetic and structural benefits.

A cantilever is a rigid structural element extending horizontally and supported at only one end.