Answer
(a) $-270°=-\frac{3\pi}{2}rad$
(b) $144°=\frac{4\pi}{5}rad$
Work Step by Step
$\pi~rad=180°$
$\frac{\pi~rad}{180°}=1$
(a) $-270°=-270°(\frac{\pi~rad}{180°})=\frac{-270°(\pi~rad)}{180°}=\frac{-3(90°)\pi}{2(90°)}rad=-\frac{3\pi}{2}rad$
(b) $144°=144°(\frac{\pi~rad}{180°})=\frac{144°(\pi~rad)}{180°}=\frac{4(36°)\pi}{5(36°)}rad=\frac{4\pi}{5}rad$
