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1* 2πr=12, r=6/π, H=8, tgα=H/2r=⅔π, α≈64st
2* 2πr=8, r=4/π, H=12, tgα=H/2r=3/2π, α≈78st
1*V=Pp*H=πr²H=π*36/π²*8=288/π
2*V=Pp*H=πr²H=π*16/π²*12=192/π