Triangular arch
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In architecture, a triangular arch (sometimes angular arch ) typically defines an arch where the intrados (inner surface of an arch) consists of two straight segments formed by two stone slabs leaning against each other. In this roof-like arrangement, mitre joint is usually used at the crown, thus the arch was in the past also called a mitre arch. Brick builders would call triangular any arch with straight inclined sides. Mayan corbel arches are also sometimes called triangular due to their shape. Since the sides of a triangular arch are experiencing bending stress, it is a false arch in a structural sense (historically preceding the invention of true arches and going back to Neolithic times ). The design was used in Anglo-Saxon England until the late 11th century (St Mary Coslany) over small openings. File:White Castle, arrow slit.jpg|A triangular arch built using masonry (White Castle, Monmouthshire) File:Kabah Arch 2002.12.29 27.jpg|Mayan corbelled arch File:Saxon doorway - geograph.org.uk - 880068.jpg|Doorway at St Peter's Church, Barton-upon-Humber (Anglo-Saxon architecture) File:Triangular arches at St Mary Coslany, Norwich.jpg|Arches at St Mary Coslany (Saxo-Norman architecture)
In architecture, a triangular arch (sometimes angular arch ) typically defines an arch where the intrados (inner surface of an arch) consists of two straight segments formed by two stone slabs leaning against each other. In this roof-like arrangement, mitre joint is usually used at the crown, thus the arch was in the past also called a mitre arch. Brick builders would call triangular any arch with straight inclined sides. Mayan corbel arches are also sometimes called triangular due to their shape. Since the sides of a triangular arch are experiencing bending stress, it is a false arch in a structural sense (historically preceding the invention of true arches and going back to Neolithic times ). The design was used in Anglo-Saxon England until the late 11th century (St Mary Coslany) over small openings. ==References== ==Sources==
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