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PANJAG KAWAT = 1,4 M = 140 cm
panjang = 15 cm
lebar = 13 cm
maka :
Rangka = 4 x (p+l+t)
140 = 4 x( 15+13+t)
140 = 4x (28+t)
140 = 112 + 4t
4t = 140-112
t = 28/4
t = 7 cm
jadi tinggi adalah 7 cm (C)
kerangka balok = 4p + 4l + 4t
= 4(15) + 4(13) + 4t
= 60 + 52 + 4t
= 112 + 4t
4t + 112 = 140
4t = 140 -112
4t = 28
t = 28 / 4
t = 7 cm