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V=a³
125=a³ /√
a³ =√125
a=5
Pc=6a² =6*5²=150 D
2)
Suma krawędzi =2*20+4h=40+4*10=80 cm C
3)
d=a√3
3=a√3 /3
a=3\√3 3\√3 * √3\√3 =√3
a=√3 B