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d-przekątna
2r-średnica
h-wysokość
h=l√3/2
h=12√3/2
h=6√3
2r=1/2l
2r=1/2*12
2r=6
r=3
Pc=2Pp+Pb
Pc=2*πr²+2πr*h
Pc=2*π3²+2π3²*6√3
Pc=18π+108√3π