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d= a+6cm
d- przekątna
d=a√3
a√3= a+6cm
a√3-a=6cm
a(√3-1)=6cm/:(√3-1)
a= 6/(√3-1)
a= 6(√3+1)/2= 3(√3+1)≈8,1
V= a³= 531,44
Pp= 6a=48,6