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5 : 2 : 3
x : y : 21
maka p = x = 21/3 x 5 = 7 x 5 = 35 cm
maka l = y = 21/3 x 2 = 7 x 2 = 14 cm
V = p x l x t
V = 35 x 14 x 21
V = 10290 cm³