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perbandingan p : l : t = 3 : 2 : 4
faktor pengali : x
jumlh rusuk = 576 cm
maka :
Rusuk = 4 x (p+l+t)
576 = 4 x (3x+2x+4x)
576 = 4 x 9x
576 = 36x
x = 576/36
x = 16 cm
jadi :
panjang = 3 x 16 = 48 cm
lebar = 2 x 16 = 32 cm
tinggi = 4 x 16 = 64 cm