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[[File:Refugi pedra Tales.jpg|thumb|Triangular arch made of two stone slabs]]
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 slabs leaning against each other.{{sfn | Woodman | Bloom | 2003 | loc=Triangular}}<ref name=oup/> In this roof-like arrangements [[mitre joint]] is usually used at the [[Crown (arch)|crown]], thus an obsolete name, ''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. 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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