A pendentive is a set of projecting moldings that crown the top edge of a temple or building.
Option A is correct.
The pendentive, in architecture, is the triangular portion of a spherical surface that fills the upper corners of the space to form circular support for the upper dome.
The pendentive is important in the history of architecture because it defined a new construction technique that allowed internal domes to reach new heights. Pendentive also created geometrically interesting ornamental interior spaces. Four hanging areas can tell a visual story.
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