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l = 2x
t = 1x atau x
Lp = 2(pl pt + lt)
306 = 2(5x . 2x + 5x . x + 2x . x)
306 = 2 (10x^2 + 5x^2 + 2x^2)
306 = 2 (17x^2)
306 = 34 x^2
9 = x^2
3 = x
Sehingga ukuran sebenarnya :
p = 15 cm
l = 6 cm
t = 3 cm
V = p x l x t
V = 15 x 6 x 3
V = 270 cm3