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a√3 - przekątna sześcianu
a√3 = 60 |:√3
a = 60/√3 * √3/√3
a = 60√3/3
a = 20√3 [cm]
D=a√3
D=60
a√3=60
a=60/√3
a=60√3 /3
a=20√3 cm
S krawedzi=12*20√3 cm=240√3 cm
a=√60=2√15