What is the name of the triangular area created between the extrados and the horizontal line passing through the apex of an arch?

Building Materials and Construction MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Building Materials and Constructioncivil-engineering-mcqs › building-materials-and-construction
Published
11 Jan 2019
Last updated
28 May 2026

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Explanation

The triangular region between the extrados (outer curve of the arch) and a horizontal line drawn at the crown of the arch is called the spandril. Haunch refers to the curved part of the arch between the crown and the supports. Voussoirs are the wedge-shaped stones forming the arch. Skewbacks are the sloping surfaces supporting the arch at its springing point.

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