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l=12 cm(krawędż boczna
V=?
Pp=a²
d=a√2
a=8cm
Pp=8*8=64 cm²
H nie mamy a więc z pitagorasa
(½d)²+H²=l²
32+H²=144
H²=112
H=10.6
V=⅓Pp * H
V=⅓64*10,6=226,13cm³