Dik:Perbandinggan Panjang:Lebar:Tinggi =3:2:1

V dalam perbandingan = 3 x 2 x 1 = 6 cm³
V asli = 750 cm³
750 cm³ : 6 = ∛125 = 5

Panjang = 3 x 5 = 15 cm
Lebar = 2 x 5 = 10 cm
Tinggi = 1 x 5 = 5 cm

Lp = 300 + 100 + 150 = 550 cm²