## Calculus (3rd Edition)

a) $\frac{\pi}{180}$ rad. b) $\frac{\pi}{6}$ rad. c) $\frac{5\pi}{36}$ rad. d) $\frac{2\pi}{3}$ rad.
a) $(1\times\frac{\pi}{180})rad = \frac{\pi}{180} rad$ b) $(30\times\frac{\pi}{180})rad = \frac{\pi}{6}rad$ c) $(25\times\frac{\pi}{180})rad = \frac{5\pi}{36}rad$ d) $(120\times\frac{\pi}{180})rad = \frac{2\pi}{3}rad$ ( Mentioning unit is not compulsory as the angle is in radians)