Question

Express the following angles in sexagesimal system.
$\frac{\pi }{2}$

Answer 1

$\because$ $\pi$ radian $={180}^{\circ }$
$\therefore$ $1$ radian $=\frac{{180}^{\circ }}{\pi }$
$\frac{\pi }{2}$ radians $=\frac{{180}^{\circ }}{\pi }\times \frac{\pi }{2}={90}^{\circ }$