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Luas sisi samping = l x t = 42 ----> l = 42/t
luas sisi depan = p x t = 60 --------> p = 60/t
Substitusikan ke persamaan plg atas
p x l = 70
42/t x 60/t = 70
42 x 60 = 70 x t x t
2520 = 70 t²
t² = 2520 / 20
t² = 36
t = √36 = 6 cm
p = 60 / t = 60/6 = 10 cm
l = 42/t = 42/6 = 7 cm
V = p x l x t = 10 x 7 x 6 = 420 cm³