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Which of the following radian measures is equal to $180^{\circ}$ ?$\newline$(The number of degrees of arc in a circle is $360$ . The number of radians of arc in a circle is $2 \pi$.)$\newline$Choose $1$ answer:$\newline$(A) $\frac{\pi}{2}$ radians$\newline$(B) $\frac{\pi}{3}$ radians$\newline$C) $\frac{\pi}{4}$ radians$\newline$(D) $\pi$ radians