S бок. пов. =2πR*H. H=?
V=S осн *H
V=π*R² *H
30√5*π=π*(√5)² * H
H=6√5
S=2*π*√5*6√5=60π
S бок.пов= 60π
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S бок. пов. =2πR*H. H=?
V=S осн *H
V=π*R² *H
30√5*π=π*(√5)² * H
H=6√5
S=2*π*√5*6√5=60π
S бок.пов= 60π