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h dl. wysokosci trojkata
a dl. boku trojkata
P=1/2ah pole pow. trojkata
r=1/3h
h=3r
h=12
h=a√3/2
a√3=2h
a=2h/√3
a=24/√3
a=24√3/3
a=8√3
P=1/2*8√3*12
P=48√3