Mathematics

Problem

2. If an angle measures

d^{\circ}

and

r

radians, which of the following relations between

d

and

r

is always true? a)

\frac{d}{r}=\frac{\pi}{180}

\frac{d}{r}=\frac{180}{\pi}

\frac{d}{r}=2\pi

\frac{d}{r}=\frac{360}{\pi}