(i) 1° = \(\frac{\pi}{180}\)radians
∴ 60° = \(\frac{\pi}{180}\) x 60 radians = \(\frac{\pi}{3}\)radians.
(ii) 150° = \(\frac{\pi}{180}\) x 150 radians = \(\frac{5\pi}{6}\)radians.
(iii) 240° = \(\frac{\pi}{180}\) x 240 radians = \(\frac{4\pi}{3}\)radians.
(iv) -320° = \(\frac{\pi}{180}\) x -320 = \(\frac{-16\pi}{9}\)radians