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AC^2 = AB^2 + BC^2
(x+2)^2 = (x+1)^2 + x^2
x^2 + 4x + 4 = x^2 + 2x + 1 + x^2
0 = x^2 - 2x - 3
0 = (x-3) (x+1)
x1 = 3 x2 = -1
karena x tidak mungkin bernilai negatif ambil x = 3
berarti AB = 3+1 = 4
dan BC = 3
volume = p x l x t
volume = 4 x 3 x 2
volume = 24 cm^3