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Arch (architecture)
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In masonry, a curved structure that supports the weight of material over an open space, as in a bridge or doorway. The first arches consisted of several wedge-shaped stones supported by their mutual pressure. The term is also applied to any curved structure that is an arch in form only, such as the Arc de Triomphe, Paris, 1806–36.
The Romans are credited with engineering the earliest round keystone arches, used for aqueducts. Other forms of arch include the pointed arch, the corbelled arch of the Maya Indians, the medieval lancet and ogee arches, and the Islamic horseshoe arch.
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Orange stands for the savannah. White symbolizes the country's rivers. Green represents the forests. Effective date: 3 December 1959.
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