We have, π Radians = 180° ⇒ 1 radian = $\left(\frac{180}{\pi}\right)^{\circ}$ (i) $\frac{11}{16}$ radians = $\left(\frac{11}{16} \times \frac{180}{\pi}\right)^{\circ}$ = $\left(\frac{315}{8}\right)^{\circ}$ = 39° 22' 30" [Since 1° = 60'] (ii) - 4 radians = $\left(\frac{-4 \times 180}{\pi}\right)^{\circ}$ = - 229° 5' 27" (iii) $\frac{5\pi}{3}$ radians = $\left(\frac{5}{3} \times \frac{180}{\pi}\right)^{\circ}$ = 300° (iv) $\frac{7\pi}{6}$ radians = $\left(\frac{7\pi}{6} \times \frac{180}{\pi}\right)^{\circ}$ = 210°