Dickson Ward
10/16/2023 · High School
Da un punto \( P \) esterno a una circonferenza di centro \( C \) si mandano le tangenti \( P A \) e \( P B \). Sapen- do che \( \cos \wedge \widehat{P B}=-\frac{7}{25} \) e che \( P C=15 \mathrm{~cm} \), de- termina i valori delle funzioni goniometriche de- gli angoli \( C \widehat{P A} \) e \( P \widehat{C} A \) e il raggio della circonfe- renza. \( \left[\sin C P A=\frac{4}{5} ; \sin P \widehat{C A}=\frac{3}{5}, r=12 \mathrm{~cm}\right] \)
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\[
\sin \angle CPA = \frac{4}{5}, \quad \sin \angle PCA = \frac{3}{5}, \quad r = 12 \text{ cm}
\]
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