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V bola = 4/3.Phi.r^2
Cri jari dlu
1836=4.22/7.r^2
1836/4 = 22/7.r^2
459=22/7.r^2
r^2=459.7/22
Msukan ke rumus V
V=4/3.22/7.459.7/22
v=4/3.459
=612