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  4. Convert 40°20' into radian measure.

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Q. Convert $40^{\circ}20'$ into radian measure.

Trigonometric Functions

Solution:

We know that $180^{\circ}=\pi$ radian
Hence $40^{\circ}20'=40 \frac{1}{3}$ degree $=\frac{121 \pi}{540}$ radian
Therefore $40^{\circ}20'=\frac{121\pi}{540}$ radian.