when doing that kind of problems, make sure to recognize what is hypothenuse, what are legs, and which one is to find
formula you need is: c^2=a^2+b^2 where c is hypothenuse, a and b are legs
it means
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the biggest square has the exact same area as the other two squares put together
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an example:
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Let's check if the areas are the same:
3^2 + 4^2 = 5^2
Calculating this becomes:
9 + 16 = 25
25=25
