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x^2 + (1/2 x V2 )^2 = (6V2)^2
x^2 + 1/4 . 2 . x^2 = 72
x^2 + 1/2 x^2 = 72
3/2 x^2 = 72
x^2 = 48
x = V48
x = 4 V3, permisalan x itu HD panjang rusuk