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a : t = 2y : 3y
L = a x t x 1/2
243 = 2y x 3y x 1/2
243 = y x 3y
243 = 3y²
243 : 3 = y²
81 = y²
√81 = y
9 = y
tinggi = 3y = 3 x 9 = 27 cm