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5 : 3
5y : 3y
L = (a+b) x t x 1/2
320 = (5y + 3y) x 16 x 1/2
320 = 8y x 8
320 = 64y
320 : 64 = y
5 = y
panjang sisi alas = 5y = 5 x 5 = 25 cm
panjang sisi atas = 3y = 3 x 5 = 15 cm