Odpowiedzi

2010-04-15T15:09:32+02:00
Dane: Pb=60πcm²
Pc = 78πcm²

Pb=2πrh
Pc=2Pp + Pb
Pp= πr²
V=πr²h

78πcm²=2Pp + 60cm²
18πcm²=2Pp /:2
9πcm²=Pp=πr²
9cm²=r² /√
3cm=r

60πcm²=2π9cmh
60πcm²=18cmπh
42cm=h

V=π9cm²42cm=378πcm³
1 5 1