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jmlh rusuk balok = 4(p) + 4(l) + 4(t)
140 = 4(15) + 4(13) + 4(t)
140 = 60 + 52 + 4t
140 = 112 + 4t
28 = 4t
t = 7cm
= 140 cm
kragka = 4(p+l+t)
140 = 4 ( 15 + 13 + t)
140 = 4 ( 28 +t)
140 = 112 + 4t
140 -112 =4t
28 = 4t
28/4 = t
7 = t
jawabaya adalah 7 cm