Answer:
Explanation:
No it is not because it's not even a right triangle
No, they are not Pythagorean triple
Pythagorean's theorem,
Hypotenuse² = base² + altitude²
23² = 21² + 9²
529 = 441 + 81
529 ≠ 522
As 9 , 21 , 23 doesn't satisfies Pythagorean theorem, they are not Pythagorean triple
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