The area of a rational right triangle cannot be a square number. This statement is equivalent to "a congruum cannot be a square number."
See alsoCongruum,
Rational Triangle,
Right Triangle,
Square Number Explore with Wolfram|AlphaMore things to try:
Cite this as:Weisstein, Eric W. "Fermat's Right Triangle Theorem." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/FermatsRightTriangleTheorem.html
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