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	steam distillation steam engine steam point steel Stefan's law stellar evolution stellar wind steradian stere stimulated emission Stirling engine STM stochastic process stokes Stokes' law Stokes' parameters Stokes' theorem Stokes, Sir George Gabriel stop stopping power storage ring strain strain gauge strain hardening strange attractor

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