Sбок.пов.=2Пrh, h=20
Sосн=Пr²
64П=Пr²
r²=64
r=8
Sбок.пов.=2П*8*20=320П
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Sбок.пов.=2Пrh, h=20
Sосн=Пr²
64П=Пr²
r²=64
r=8
Sбок.пов.=2П*8*20=320П