What is the shape of a pendentive?

A pendentive is a specific architectural feature that serves as a transition element between a dome and the supports below it, typically in a space where a circular dome is placed over a square room. The shape of a pendentive can be best described as a triangle, specifically a curved triangle that arises from the corners of the square support. This triangular form allows for a smooth integration from the square base to the circular dome by curving up to meet it.

This structural element is significant in various architectural styles, particularly in Byzantine and Islamic architecture, allowing for innovative designs and effective weight distribution of domes. The triangular shape effectively supports the dome while providing aesthetic appeal. Therefore, identifying the shape of a pendentive as a triangle reflects a correct understanding of its function and form in architectural design.