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⅔h=12cm
h=12:⅔=18cm
a√3:2=18
a√3=36
a=36√3;3
a=12√3cm= krawedź podstawy
Pp=a²√3;4=(12√3)²√3:4=108√3
Pb=3ah=3×12√3×20=720√3
Pc=2×108√3+720√3=936√3cm³
v=PpH=108√3×20=2160√3cm³
Pp=2*3,14*6²
Pp=226,08
V=⅓Pp*h
V=75,36*20
V=1507,2