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5 : 4 : 3
panjang rangka = 144 cm
maka :
Rangka = 4 x (pxlxt)
144 = 4 x (5x + 4x + 3x)
144 = 4 x (12x)
144 = 48 x
x = 144/48
x = 3 cm
jadi panjang = 5x = 5 x 3 = 15 cm
lebar = 4x = 4 x 3 = 12 cm
tinggi = 3x = 3 x 3 = 9 cm
P.Krngka = 4(P+L+T)
144 = 4 (5x+4x+3x)
144/4 = (12x)
36 = 12x
x = 36/12 = 3
T= 3(3) = 9cm