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v balok = 12*9*8 = 864 cm³
prasaan td udh jwb ini :)
17 = √12² + 9² + t²
kuadratkan
289 = 12² + 9² + t²
289 = 144 + 81 + t²
289 = 225 + t²
t² = 289 - 225
t² = 64
t = √64
t = 8 cm
volume = 12 * 9 * 8
= 864 cm³