This may be the long way but high school math was a long time ago:
Volume = (pi)(r^2)h
so (3.14)(radius^2)height
so for example radius 10 cm height 20cm
(3.14)*(10^2)(20)
3.14* 100*20 = 6280 cm3
1 cm3 = 1 ml
1000ml=1 litre
so 6.280 litres.
3.84 litres = 1 gallon
1.635 gallons
Cheers,
Vic [veng68]
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