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r-1,2cm
H-120cm
1cm3-0,5g
Pc = 2пr2 + 2пr * H
Pc=2*3,14*1,44+1,2*3.14*120
Pc=9.04+904,32
Pc=913,36cm3
913,36*0,5=456,68g
b)
r-0,01cm
h-3000cm
Pc = 2пr2 + 2пr * H
Pc=2*3.14*0.0001+2*3,14*3000
Pc=0,000628+188,4
Pc=188,400628
188,4*8,96=1688,064g