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ta figura to jakiś czworokont z kontami prostymi(prpstokąt)
tg 30°=√3/3
tg=DC/AD
DC/AD=√3/3
6/AD=√3/3
AD√3=18 /*√3
3AD=18√3/3
AD=6√3
ZATEM OB= 12√3CM +12CM