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p = 10 cm
l = 8 cm
Rusuk = 4(p + l + t)
100 = 4(10 + 8 + t)
100 = 4(18 + t)
100 = 72 + 4t
100 - 72 = 4t
28 = 4t
7 = t
Jadi tinggi balok adalah 7 cm.