Установите соответствие
\(\dfrac {\pi} {4} =\)
\(\dfrac {2\pi} {3} =\)
\(\dfrac {\pi} {6} =\)
\(\dfrac {\pi} {2} =\)
\[30^\circ\]
\[45^\circ\]
\[90^\circ\]
\[120^\circ\]