Odpowiedzi

2010-03-18T08:49:42+01:00
Pc= 54π cm²
Pc= 2π r² +2πrh
2r =h

54π = 2π r² + 2πr* 2r
54π = 2π r² + 4 π r²
54π = 6π r² / : 6π
9 =r²
r= 3 cm

h= 2*3 = 6 cm
1 5 1