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This article needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (May 2008) The pendentives are shown in yellow. A pendentive is a constructive device permitting the placing of a circular dome over a square room or an elliptical dome over a rectangular room. [1] The pendentives, which are triangular segments of a sphere, taper to points at the bottom and spread at the top to establish the continuous circular or elliptical base needed for the dome.[2] In masonry the pendentives thus receive the weight of the dome, concentrating it at the four corners where it can be received by the piers beneath. Prior to the pendentive's development, the device of corbelling or the use of the squinch in the corners of a room had been employed. Pendentives were commonly used in Orthodox, Renaissance, and Baroque churches, with a drum with windows often inserted between the pendentives and the dome. The first experimentation with pendentives were made in Roman dome construction beginning in the 2nd–3rd century AD,[3] while full development of the form was achieved in the 6th century Eastern Roman Hagia Sophia at Constantinople.[4] The diameter of its central dome remained unsurpassed anywhere in the world until the Renaissance Florence Cathedral, itself not a pendentive dome.[5] Gallery Arches (left and right), dome (top) and pendentive (centre) in Moscow Cathedral Holy Trinity Church in the Czech Republic Formation of a pendentive A pendentive, labelled A Pendentive structure References ^ http://www.encyclopedia.com/topic/pendentive.aspx#1E1-pendenti The Columbia Encyclopedia, sixth edition ^ http://www.britannica.com/EBchecked/topic/449698/pendentive ^ Rasch 1985, pp. 129f. ^ Heinle & Schlaich 1996, pp. 30–32 ^ Heinle & Schlaich 1996, p. 32 Sources Heinle, Erwin; Schlaich, Jörg (1996), Kuppeln aller Zeiten, aller Kulturen, Stuttgart, ISBN 3-421-03062-6  Rasch, Jürgen (1985), "Die Kuppel in der römischen Architektur. Entwicklung, Formgebung, Konstruktion", Architectura 15: 117–139  Wikimedia Commons has media related to: Pendentives This architectural element-related article is a stub. You can help Wikipedia by expanding it. v • d • e