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  "body": "\n## Summary\n\nPolar coordinates describe a point of the plane by two numbers. They are its distance $r$ from the origin and the angle $\\theta$ from the positive $x$-axis to the ray through the point.\nThey simplify problems with circular symmetry, such as integrals over discs.\n\n## Remarks\n\nThe polar form of a complex number is a related idea: see [[polar form|0BRXFNQ5JV]].\n",
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