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9.1: Ángulo entre una línea tangente y una cuerda
https://espanol.libretexts.org/Matematicas/Geometria/Avi%C3%B3n_Euclideano_y_sus_Familiares_(Petrunin)/09%3A_%C3%81ngulos_inscritos/9.01%3A_%C3%81ngulo_entre_una_l%C3%ADnea_tangente_y_una_cuerda
$2 \cdot \measuredangle QXY \equiv \measuredangle XOY.$ $\measuredangle QXY \equiv \dfrac{1}{2} \cdot \measuredangle XOY$ o $\measuredangle QXY \equiv \dfrac{1}{2} \cdot \measuredangle XOY + \pi.$ ... $2 \cdot \measuredangle QXY \equiv \measuredangle XOY.$ $\measuredangle QXY \equiv \dfrac{1}{2} \cdot \measuredangle XOY$ o $\measuredangle QXY \equiv \dfrac{1}{2} \cdot \measuredangle XOY + \pi.$ $\begin{array} {rcl} {\pi} & \equiv & {\measuredangle YXO + \measuredangle OYX + \measuredangle XOY \equiv} \\ {} & \equiv & {2 \cdot \measuredangle YXO + \measuredangle XOY.} \end{array}$ $2 \cdot \measuredangle QXY \equiv \pi - 2 \cdot YXO \equiv \measuredangle XOY.$

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