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Geometry: The Tangent Ratio
The Tangent RatioGeometryThe Unit Circle and TrigonometryThe Tangent RatioThe Sine RatioThe Cosine RatioAnd the RestHow Does This Relate to the Unit Circle? Trigonometry got its start from…arc, in geometry
(Encyclopedia) arc, in geometry, a curved line or any part of it; in particular, a portion of the circumference of a circle. The length s of an arc of a circle of radius r and subtending a central…curve
(Encyclopedia) curve, in mathematics, a line no part of which is straight; more generally, it is considered to be any one-dimensional collection of points, thus including the straight line as a…sphere
(Encyclopedia) sphere, in geometry, the three-dimensional analogue of a circle. The term is applied to the spherical surface, every point of which is the same distance (the radius) from a certain…tangent
(Encyclopedia) tangent, in mathematics. 1 In geometry, the tangent to a circle or sphere is a straight line that intersects the circle or sphere in one and only one point. For other curves and…Desargues, Gérard
(Encyclopedia) Desargues, GérardDesargues, Gérardzhārärˈ dəzärgˈ [key], 1591–1661, French mathematician and engineer, a founder of modern geometry. He discovered the theorems on involutions and…Playfair, John
(Encyclopedia) Playfair, John, 1748–1819, Scottish mathematician, physicist, and geologist. He was educated at St. Andrews and Edinburgh and taught first mathematics and then physics and astronomy at…Wallis, John
(Encyclopedia) Wallis, JohnWallis, Johnwŏlˈĭs [key], 1616–1703, English mathematician. He was Savilian professor of geometry at Oxford from 1649. He systematized the use of formulas, introduced the…chord, in geometry
(Encyclopedia) chordchordkôrd [key], in geometry, straight line segment both end points of which lie on the circumference of a circle or other curve; it is a segment of a secant. A chord passing…Pearson, Karl
(Encyclopedia) Pearson, Karl, 1857–1936, English scientist. He studied law, taught geometry, and applied mathematics and mechanics, and in 1911 became professor of eugenics at the Univ. of London and…Trending
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