Convert $40^{\circ} 20^{\prime}$ into radian measure.
Convert $40^{\circ} 20^{\prime}$ into radian measure.
We know that $180^{\circ}=\pi$ radian.
Hence $\quad 40^{\circ} 20^{\prime}=40 \frac{1}{3}$ degree $=\frac{\pi}{180} \times \frac{121}{3}$ radian $=\frac{121 \pi}{540}$ radian.
Therefore $40^{\circ} 20^{\prime}=\frac{121 \pi}{540}$ radian.
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