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a=3cm
b=11,6cm
h=2,5*11,6=29cm
P=211,7
licze na naj :)!
a=3cm
b=11,6cm
h=2,5*11,6=29cm
Ppc=(3cm+11,6cm)*29cm/2
Ppc=14,60*29cm/2
Ppc=423,4/2
P=211,7