Question

Em qual quadrante está o arco (-47pi)/(20) radianos?

Answer 1

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$\sf\dfrac{47\pi}{20}=\dfrac{40\pi}{20}+\dfrac{7\pi}{20}=2\pi+\dfrac{7\pi}{20}\\\sf-\dfrac{47\pi}{20}=-2\pi-\dfrac{7\pi}{20}\\\sf -\dfrac{7\pi}{20}+2\pi=\dfrac{33\pi}{20}\implies3^{\underline{o}}~quadrante$