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Tinggi balok = CG
DR = √AB² + BC² + CG²
13 = √4² + 3² + CG²
13 = √16 + 9 + CG²
13 = √25 + CG²
169 = 25 + CG²
CG² = 169 - 25
CG² = 144
CG = √44
CG = 12 cm
Jadi, tinggi balok adalah 12 cm