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17 = √12²+9² +t²
√289 = √144+81+t²
t = √289-144+81
t = √64 = 8 cm
volume = p x l x t = 12 x 9 x 8 = 864 cm²
17 = √ 12² + 9² + t²
17 = √144 + 81 + t²
t = √ 17² - 225
= √ 289 - 225
=√ 64
= 8 cm
V = p x l x t
= 12 x 9 x 8
= 864cm³