R u m f a n g = 1 3 ⋅ π ⋅ h 2 ⋅ ( 3 r − h ) Rumfang=1/3·π·h^2·(3r-h)
O v e r f l a d e = 2 ⋅ π ⋅ r ⋅ h Overflade=2·π·r·h