"\\(r_Q, \\rho\\)"^^ . . . . "In classical geometry, the \"Radial Distance\" is a coordinate in polar coordinate systems (r, \\(\\theta\\)). Basically the radial distance is the scalar Euclidean distance between a point and the origin of the system of coordinates."^^ . "Radial Distance"@en . . . . . . . . . . . . . . . . . "http://www.iso.org/iso/catalogue_detail?csnumber=43012"^^ . . . . . . . . "http://en.wikipedia.org/wiki/Radial_distance_(geometry)"^^ . . . . . . . "\\(d = \\sqrt{r_1^2 + r_2^2 -2r_1r_2\\cos{(\\theta_1 - \\theta_2)}}\\), where \\(P_1\\) and \\(P_2\\) are two points with polar coordinates \\((r_1, \\theta_1)\\) and \\((r_2, \\theta_2)\\), respectively, and \\(d\\) is the distance."^^ . . . . . . . . .