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obliczamy wysokosc z sin30=h/4 wiec h=2
Pole podstawy: ah = 6*2 = 12
Pola scian: 2*6*H+2*4*H.
Suma pol 20H+24=72, wiec 20H=48, wiec H=2,4.
V=4*6*2,4=57,6 (chyba :) ).