Biangular coordinates

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Biangular coordinates

In mathematics, biangular coordinates are a coordinate system for the plane where C_1\,\! and C_2\,\! are two fixed points, and the position of a point P not on the line \overline{C_1C_2}\,\! is determined by the angles \angle PC_1C_2\,\! and \angle PC_2C_1\,\! .

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