Posted by Anonymous on Saturday, April 24, 2010 at 4:31pm.
|OA|=|OB|=OC| symmetry
Add components in direction of OA
|OA| - |OB| sin 30 - |OC| sin 30
but sin 30=1/2
Add components perpendicular to OA
|OC|cos 30 - |OB| cos 30 = 0
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