Answer :
Four pendentives have been used by the architects at the pinnacle corners of a room, in which they curved inward to satisfy the bottom of the dome.
The required details about Hagia Sophia is mentioned in below paragraph.
In the Hagia Sophia, a constructing that dates again to round 537 AD and is positioned in Istanbul, Turkey, one of the earliest examples architects of pendentives can be found. Hagia Sophia, which capabilities a big 32-meter most important dome supported on pendentives (triangular segments of a round surface) and semi-domes, blends a longitudinal basilica and a centrally positioned constructing in a different Byzantine manner. The Greek Orthodox Christian Church firstly commissioned the development of the Hagia Sophia (Ayasofya in Turkish). But over the ages, its motive has evolved architects endless times. The first Hagia Sophia become constructed via way of means of order of the Byzantine Emperor Constantius in 360 A.D. He built 4 massive columns at one of every square's corners. He built 4 arches on pinnacle of the columns. After that, he constructed pendentives—curved triangular shapes—withinside the masonry he had formerly stuffed the areas among the arches. A strong base for the dome is created via way of means of the pendentives and the tops of the arches.
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