A groin vault is formed by the perpendicular intersection of two barrel vaults. A rib ribbed vault is supported by a series of arched diagonal ribs that divide the vault's surface into panels.
Explanation:
A groin (or cross) vault is formed by the perpendicular intersection of two barrel vaults. A rib (or ribbed) vault is supported by a series of arched diagonal ribs that divide the vault's surface into panels.
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