如图,在矩形\(ABCD\)中,\(O\)为\(AC\)中点,\(EF\)过\(O\)点且\(EF⊥AC\)分别交\(DC\)于\(F\),交\(AB\)于\(E\),点\(G\)是\(AE\)中点且\(∠AOG=30^{\circ}\),则下列结论正确的个数为\((\) \()\)
\((1)DC=3OG\);\((2)OG= \dfrac {1}{2}BC\);\((3)\triangle OGE\)是等边三角形;\((4)S_{\triangle AOE}= \dfrac {1}{6}S_{ABCD}\).