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V=⅓×16cm²×h
2²+h²=5²
4+h²=25
h²=21
h=√21cm
V=⅓×16cm²×√21cm
V=16√21/3cm³<<<ułamek i odpowiedź
Ppc=16+4(½×4×5)
Ppc=16+40
Ppc=56cm²