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Which of the following sets of numbers could be the side lengths of a right triangle?

3, 4, and 7
9, 40, and 42
8, 15, and 16
20, 21, and 29

Respuesta :

I would say the answer is B 9, 40, and 42

the answer is  20,21,29 because  

20 times 20 is 400

21 times 21 is 441

and 29 times 29 is 841

the formula to ge tthe answer is a^2 + b^2 = c^2

20^2 + 21^2= 29^2

then plug the rest in

400+441= 841

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