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√261 = √(4x)^2 + (2x)^2 + (3x)^2
√261 = √16x^2 + 4x^2 + 9x^2
261 = 29x^2
x^2 = 261/29
x^2 = 9
x = 3
panjang = 4x = 4(3) = 12 cm
lebar = 2x = 2(3) = 6 cm
tinggi = 3x = 3(3) = 9 cm