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160 = 4 × 4x + 4 × 3x + 4x
160 = 16 x + 12 x + 4x
160 = 32x
x = 160 : 32 = 5
p = 4 × 5 = 20 cm
l = 4 × 5 = 15 cm
t = 5 cm
Lp = 2(pl + pt + lt)
Lp = 2(20×15 + 20×5 + 15×5)
Lp = 2(300 + 100 + 75)
Lp = 2 × 475 = 950 cm²
V = plt
V = 20 × 15 × 5
V = 1500 cm³
Maaf kalau ada kesalahan
4 : 3 : 1
4.4x : 3.4x : 1.4x
= 16x + 12x + 4x = 160
32x = 160
x = = 5
Panjang = = 20cm
Lebar = = 15cm
Tinggi = = 5cm
a. Jumlah luas permukaan balok = 2 x ( p x l + p x t + l x t )
= 2 x ( (20x15) + (20x5) + (15x5) )
= 2 x ( 300 + 100 + 75 )
= 950
b. volume balok = p x l x t
= 20 x 15 x 5
= 1500