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h=2a
a²√3/4+½a*2a=12+√3 //*4
a²√3+2a*2a=48+4√3
a²√3+4a²=48√3 //:√3
a²+4a²/√3=48
a²+4a²√3/3=48 //*3
3a²+4a²√3=144
dalej niewiem