# Polar coordinates/Related Articles

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*See also changes related to Polar coordinates, or pages that link to Polar coordinates or to this page or whose text contains "Polar coordinates".*

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- Complex number [r]: Numbers of the form
*a+bi*, where*a*and*b*are real numbers and*i*denotes a number satisfying .^{[e]} - Jacobian [r]: Determinant of the matrix whose ith row lists all the first-order partial derivatives of the function ƒi(x1, x2, …, xn).
^{[e]} - Plane (geometry) [r]: In elementary geometry, a flat surface that entirely contains all straight lines passing through two of its points.
^{[e]} - Point (geometry) [r]: An object that has a position but no length, breadth or depth.
^{[e]} - Spherical polar coordinates [r]: Angular coordinates on a sphere: longitude angle φ, colatitude angle θ
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