Editing Right angle (section)

== Symbols ==
[[Image:Rtriangle.svg|thumb|Right triangle, with the right angle shown via a small square]]
[[File:Triangle 30-60-90 rotated.png|thumb|Another option of diagrammatically indicating a right angle, using an angle curve and a small dot]]

In [[Unicode]], the symbol for a right angle is {{unichar|221f|Right angle|html=}}. It should not be confused with the similarly shaped symbol {{unichar|231e|Bottom left corner|html=}}. Related symbols are {{unichar|22be|Right angle with arc|html=}}, {{unichar|299c|Right angle variant with square|html=}}, and {{unichar|299d|Measured right angle with dot|html=}}.<ref>Unicode 5.2 Character Code Charts [https://www.unicode.org/charts/PDF/U2200.pdf Mathematical Operators], [https://www.unicode.org/charts/PDF/U2980.pdf Miscellaneous Mathematical Symbols-B]</ref>

In diagrams, the fact that an angle is a right angle is usually expressed by adding a small right angle that forms a square with the angle in the diagram, as seen in the diagram of a right triangle (in British English, a right-angled triangle) to the right. The symbol for a measured angle, an arc, with a dot, is used in some European countries, including German-speaking countries and Poland, as an alternative symbol for a right angle.<ref>{{cite book |last1=Müller-Philipp|first2=Hans-Joachim|last2=Gorski |first1=Susanne  |year=2011 |title=Leitfaden Geometrie |trans-title=Handbook Geometry |url=https://books.google.com/books?id=PAdSPOBYHPUC |language=de |publisher=Springer |isbn=9783834886163}}</ref>