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pnjang kawat = 1,8 m = 180 cm
ukuran p = 20 cm, l = 17 cm
maka :
Kerangka = 4 x (p+l+t)
180 = 4 x (20 + 17 + t)
180 = 4 x (37+ t)
180 = 148 + 4t
t = 180-148 / 4
t = 8 cm
jadi tinggi = 8 cm