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Basis of trigonometry: if two right triangles have equal acute angles, they are similar, so their corresponding side lengths are proportional.. In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [1] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.
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Slide rules had special scales for trigonometric functions. [50] Scientific calculators have buttons for calculating the main trigonometric functions (sin, cos, tan, and sometimes cis and their inverses). [51] Most allow a choice of angle measurement methods: degrees, radians, and sometimes gradians.
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Graphs of historical trigonometric functions versin, coversin, vercosin, covercosin, haversin, hacoversin, havercosin and hacovercosin compared with sin and cos by CMG Lee. In the SVG file, hover over or click a graph to highlight it.
The following outline is provided as an overview of and topical guide to trigonometry: Trigonometry – branch of mathematics that studies the relationships between the sides and the angles in triangles. Trigonometry defines the trigonometric functions, which describe those relationships and have applicability to cyclical phenomena, such as waves.
Pages in category "Trigonometric functions" The following 69 pages are in this category, out of 69 total. This list may not reflect recent changes. ...