Answer :
Pendentive in design, a three-sided section of a round surface, filling in the upper corners of a room, to shape, at the main, a roundabout help for a vault.
Normally ornamented and four to a vault, pendentives cause the arch to show up as though it's lingering palpably, similar to a "swinging." The word is from the Latin pendens signifying "hanging." Pendentives are utilized for balancing out a round arch on a square casing, bringing about huge inside open space underneath the arch.
Albeit seldom utilized, the pendentive vault was known in second century Roman design and conceivably prior, in funerary landmarks, for example, the Sedia dei Diavolo and the Torracio della Secchina on the By means of Nomentana. Pendentive vaults would be utilized significantly more broadly in the Byzantine period.
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