An arched masonry structure that spans an interior space and is created by intersecting two semi-circular masonry structures, creating four side compartments of identical size and shape. it's weight and outward thrust are concentrated on four corner

This is more of a vault than an arch.

Explanation:

Although both have arched masonry structures that spans two columns, a vault creates a canopied space that may be used for different purposes. Arches may be lined along a corridor or hallway, but not actually provide a roofed space underneath.

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