Sea un punto perteneciente a dicha circunferencia.
La ecuación de la recta tangente a la circunferencia que pasa por dicho punto será perpendicular al radio que pasa por P, y se puede demostrar que su ecuación es:[1]
Demostración
La ecuación de la recta tangente por será
El problema se reduce a encontrar la pendiente m tal que la recta resultante sea perpendicular al radio que pasa por P. Una vez obtenida la pendiente de la recta , la pendiente buscada será .
Las coordenadas del centro O de la circunferencia son . Por tanto
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