Find the radian measures corresponding to the following degree measures:

$-47^{\circ} 30^{\prime}$

$-47^{\circ} 30^{\prime}-47 \frac{1}{2}$

$=\frac{-95}{2}$ degree

since $180^{\circ}=\pi$ radian

$\frac{-95}{2}$ degree $=\frac{\pi}{180} \times\left(\frac{-95}{2}\right)$ radian $=\left(\frac{-19}{36 \times 2}\right) \pi$ radian $=\frac{-19}{72} \pi$ radian

$\therefore-47^{\circ} 30^{\prime}=\frac{-19}{72} \pi$ radian