Arches - A Curved structure

An arch is a curved structure that spans a space and may or may not support weight above it. Arch may be synonymous with vault but vault may be distinguished as a continuous arch forming a roof. Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture and their systematic use started with the Ancient Romans who were the first to apply the technique to a wide range of structures.

Arches - A Curved structure by bharathiya 

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