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l = 9 cm
dR = 17 cm
dR² = p² + l² + t²
17² = 12² + 9² + t²
289 = 144 + 81 + t²
t² = 289 - 144 - 81
t² = 64
t = 8 cm
volume balok = p x l x t
= 12 x 9 x 8
= 864 cm³
semoga membantu ya :)