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s² + s² = c²
2s² = 82²
2s² = 6724
s² = 3362
√s² = √3362
√s² = √1681×2
s = 41√2
V = s³
= (41√2)³
= 68921√8 cm³
= 68921 √4×2 cm³
= 68921 2√2
= 137842√2 cm³