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We're pretty sure you're looking for the two "legs", not the two "lengths".

The answer is: You can't tell. There are an infinite number of different right

triangles with different leg-lengths that all have hypotenuses of 4.2 .

The only thing you know about the two legs is that the squares of their legs

add up to 17.64, but there's no way to know both individual lengths.

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Q: What are the two lengths of a right angle triangle with a hypotenuse of 4.2?
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