单词	polar coordinates
释义	polar coordinates A system used in analytical geometry to locate a point P, with reference to two or three axes. The distance of P from the origin is r, and the angle between the x-axis and the radius vectorOP is θ, thus in two-dimensional polar coordinates the coordinates of P are (r,θ). If the Cartesian coordinates of P are (x,y) then, x = rcosθ and y = rsinθ . In three dimensions the point P may be regarded as lying on the surface of a cylinder, giving cylindrical polar coordinates , or on the surface of a sphere, giving spherical polar coordinates . In the former the coordinates of P would be (r,θ,z); in the latter they would be (r,θ,φ) (see illustration). Polar coordinates
随便看	circular polarization cladding Clapeyron-Clausius equation Clark cell classical field theory classical physics Claude process Clausius, Rudolf Julius Emmanuel Clausius-Mossotti equation close packing cloud chamber Clusius column cluster coagulation coal coaxial cable cobalt steel COBE Cockcroft-Walton generator Cockroft, Sir John Douglas coefficient coefficient of expansion coefficient of friction coelostat coercive force

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