Biangular coordinates explained

In mathematics, biangular coordinates are a coordinate system for the plane where

C₁

and

C₂

are two fixed points, and the position of a point P not on the line

\overline{C_1C_2}

is determined by the angles

\anglePC_1C₂

and

\anglePC_2C_1.

The sine rule can be used to convert from biangular coordinates to two-center bipolar coordinates.

Applications

Biangular coordinates can be used in geometric modelling and CAD.