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d=przekątna
d=a√3
a√3=3+a
a√3-a=3
a(√3-1)=3
a=3:(√3-1)
a=1,5√3+1,5
v=a³
v=(1,5√3+1,5)³=10,125√3+30,375+10,125√3+3,375=
20,25√3+33,75