# polar coordinates

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Related to polar coordinates: Spherical coordinates

## polar coordinates

pl n
(Mathematics) a pair of coordinates for locating a point in a plane by means of the length of a radius vector, r, which pivots about the origin to establish the angle, θ, that the position of the point makes with a fixed line. Usually written (r, θ). See also Cartesian coordinates, spherical coordinates
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

## po′lar coor′dinates

n.pl.
two coordinates for locating a point in a plane by the length of its radius vector and the angle this vector makes with the polar axis.
[1810–20]

## polar coordinates

1. Coordinates derived from the distance and angular measurements from a fixed point (pole).
2. In artillery and naval gunfire support, the direction, distance, and vertical correction from the observer/spotter position to the target.
Dictionary of Military and Associated Terms. US Department of Defense 2005.
References in periodicals archive ?
They cover preparation for calculus; limits and their properties; differentiation; applications of differentiation; integration; differential equations; applications of integration; integration techniques and improper integrals; infinite series; conics, parametric equations, and polar coordinates; vectors and the geometry of space; vector-valued functions; functions of several variables; multiple integration; and vector analysis.
The transverse wave function [f.sub.[rho], [phi]](z) with fixed polar coordinates [rho],[phi] satisfies additional Ben Daniel Duke boundary condition at the bottom of the layer with the coordinate z = 0 and at each point of the top of the layer z = d ([rho], [phi]).
Given a point p, the shape context of p is defined as a coarse histogram of the relative polar coordinates of the other points, written as
then after deformation, if we will use polar coordinates R, [alpha], where R = r - u and the formula for determining the curvature, we will get:
The RE is parameterized and represented in polar coordinates and given in the following form:
and the relations of [[phi].sub.i], i = 1, ..., n - 1, are the same as those in the case of usual polar coordinates. For calculating the Jacobian, we refer to the proof of Theorem 3.1 in  that can be extended to the n-dimensional case.
In this section, the design variables and mathematical model which influence the performance of ACO are constructed under polar coordinates. Moreover, main objective is improvement by considering a relative position relationship of machines.
If amplitude spectra (computed by means of the discrete Fourier transform) are transformed to polar coordinates, only a half of the domain on the angular axis is sufficient.
In Figure 2, we represent the force exerted by an infinitesimal mass dM of the disk on the mass m using polar coordinates. Because of the symmetry of the disk with respect to the axis passing between its center and the mass m, we need to compute the projection of the force exerted by the infinitesimal mass dM on this axis.
Our measurements were performed in polar coordinates and the image was conveniently drawn in Cartesian coordinates

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