[tex]This\ triangle\ is\ a\ half\ of\ equilateral\ triangle\ which\ sides\ are\ 22\ m.\\\ so:\\side\ opposite\ 30\ degree\ angle\ is\ height\ of\ this\ equilateral\ triangle:\\h= \frac{a\sqrt3}{2},\ where\ a=22\\h= \frac{22\sqrt3}{2}=11\sqrt3\\\\Length\ of\ the\ side\ opposite\ 30\ degrees\ is\ 11\sqrt3[/tex]
