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v = phi x r x r x t
v = 22/7 x 14 x 14 x 20
v = 22 x 2 x 14 x 20
v = 44 x 280
v = 12320
v balok = v tabung
p x l x t = 12320
20 x 14 x t = 12320
280 x t = 12320
t = 12320/280
t = 44 cm