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In [[architecture]], a '''triangular arch''' typically defines an [[arch]] where the [[intrados]] (inner surface of an arch) consists of two straight segments formed by two [[stone slab]]s leaning against each other.{{sfn | Woodman | Bloom | 2003 | loc=Triangular}}<ref name=oup/> In this roof-like<ref>{{cite book | last=Passmore | first=A.C. | title=Handbook of Technical Terms Used in Architecture and Building and Their Allied Trades and Subjects | publisher=Scott, Greenwood, and Company | year=1904 | chapter = Mitre arch | chapter-url=https://books.google.com/books?id=NawaAAAAYAAJ&pg=PA228 | access-date=2024-02-27 | page=228}}</ref> arrangement, [[mitre joint]] is usually used at the [[Crown (arch)|crown]], thus the arch was in the past also called a ''mitre arch''.<ref>{{cite web | title=mitre arch | website=[[Oxford English Dictionary]] | date=2023-07-01 | url=https://www.oed.com/dictionary/mitre-arch_n | access-date=2024-02-27}}</ref> Brick builders would call triangular any arch with straight inclined sides.<ref>{{cite book |last1=Brick Industry Association] |series=Technical Notes on Brick Construction |title=Brick Masonry Arches: Introduction |date=January 1995 |publisher=Brick Industry Association |page=2 |url=https://faculty-legacy.arch.tamu.edu/anichols/index_files/courses/arch631/NS6-1brickarch.pdf}}</ref> [[Maya civilization|Mayan]] [[corbel arch]]es are also sometimes called triangular due to their shape.{{sfn|Sturgis|Davis|2013|p=121|loc=Triangular Arch}}
Since the sides of a triangular arch are experiencing bending stress, it is a [[false arch]]<ref name=oup>{{cite book |title=The Oxford Dictionary of Architecture |date=2021 |publisher=[[Oxford University Press]] |isbn=9780191918742 |edition=4th | chapter = triangular arch }}</ref> in a structural sense (historically preceding the invention of [[true arch]]es{{sfn|Nikolich|2020|p=1862}} and going back to [[Neolithic]] times{{EB14}}). The design was common in [[Anglo-Saxon England]] until the late 11th century ([[St Mary Goslany]]).{{sfn | Woodman | Bloom | 2003 | loc=Triangular}}
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File:White Castle, arrow slit.jpg|A triangular arch built using [[masonry]] ([[White Castle, Monmouthshire]])
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