Question
$ 1 \mathrm{rad}=\ldots \ldots \ldots \ldots$(a) $180^{\circ}$(b) $3.14^{\circ}$(c) $(180 / \pi)^{\circ}$(d) $(\pi / 180)^{\circ}$
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$$\begin{array}{l}{180^{\circ}=\frac{\text { radians }}{2}} \\{\begin{array}{llll}{\text { (a) } \frac{\pi}{2}} & {\text { (b) } \pi} & {\text { (c) } \frac{3 \pi}{2}} & {\text { (d) } 2 \pi}\end{array}}\end{array}$$
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