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pi*r[kwadrat]=3V /:pi *h
r[kwadrat]= 3V/pi*h
r[kwadrat]= 3*120pi/ pi*10cm (pi się skraca)
r[kwadrat]= 360/10cm
r[kwadrat]=36
r= pierwiastek z 36
r=6cm
h=10cm
v=120πcm³
120πcm³=⅓π*r*10cm
120cm=⅓*r*10
120cm/3⅓=r
120cm*0,3=r
36cm=r