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misal :
panjang = 4x
lebar = 3x
tinggi = 2x
diket : luas alas (p x l) = 108
= 4x.3x = 108
12x² = 108
x² = 108/12
x² = 9
x = √9
= 3
panjang = 4 x 3 = 12
lebar = 3 x 3 = 9
tinggi = 2 x 3 = 6
volume = p.l.t
= 12 x 9 x 6
= 648 cm³