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d= a√2
6√2=a√2 /: √2
a=6 ⇒ r = 1/2 a = 3, H= a=6
V= PpH
Pp=πr² = π ·3² =9π
V= 9π·6=54π
Pc= 2Pp +Pb
Pb= 2πrH
Pb= 2π·3·6=36π
Pc= 2·9π + 36π=18π +36π= 54π
Odp. Pc=54πj², V= 54πj³