Answer
$\frac{\pi}{4}$ rad
Work Step by Step
Use the conversion $360^\circ=2\pi \, \textrm{rad.}$ to simplify the expression to $$45^\circ \cdot \frac{2\pi \, \textrm{rad.}}{360^\circ}=\frac{\pi}{4} \, \textrm{rad.}$$
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