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h=wysokosc=a√3/2
a+h=a+a√3/2=6 /*2
2a+a√3=12
a(2+√3)=12
a=12/(2+√3)
a=[12(2-√3)]/ [(2+√3)(2-√3)]=[24-12√3] / [ 4-3]=24-12√3=12(2-√3) cm
odp. A