sebuah berbentuk balok memiliki luas permukaan 656 dengan panjang 20 dan lebar 8 Tentukan volume balok
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L = 2(pl + pb + lb) (permukaan balok)
L = 656
p = 20
l = 8
656 = 2(20l + 8p + 8x20)
= 2(20l + 8p + 160)
= 40l + 16p + 320
40l + 16p = 656 - 320
40l + 16p = 336
5l + 2p = 42
V = p x l x t (volume balok)
V = 20 x 8 x t
V = 160t
5l + 2p = 42
5l + 2p = 42
5l + 2(20) = 42
5l + 40 = 42
5l = 2
l = 0.4
L = p x l x t
656 = 20 x 8 x t
t = 656 : 20 x 8
t = 4.1
= 20 x 8 x 4.1
= 656
volume balok = 656