Rojas Long
08/12/2023 · Primary School
\begin{tabular}{|l|l|}\hline 20 & D) 32 \\ En la figura se tienen dos circunferencias concéntricas en O. El radio de la mayor mide 12 cm y el radio de la menor \\ mide \( 9 \mathrm{~cm}^{2} \) El área de la parte gris es: \\ A) \( 3 \pi \mathrm{~cm}^{2} \) \\ B) \( 6 \pi \mathrm{~cm}^{2} \) \\ C) \( 42 \pi \mathrm{~cm}^{2} \) \\ D) \( 63 \pi \mathrm{~cm}^{2} \) \\ E) \( 144 \pi \mathrm{~cm}^{2} \)\end{tabular}
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El área de la parte gris es \( 63\pi \, \text{cm}^2 \). La respuesta correcta es D) \( 63 \pi \, \text{cm}^2 \).
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