Because the letters can represent any sum
not necessarily its only on a triangle where that happens
the hypotenuse squared equals the sum of the other two sides squared added together
like if a was 1 and b was two c could be three so 1+4 doesn't equal 9
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Because it is mathematically incorrect. a^2 + b^2 = c^2 Take square root of both sides. SQRT (a^2 + b^2) = c So you see, it is not a plus b equal c.
A^2 + B^2 = C^2 Side A squared plus Side B squared has to equal Side C squared
It is the formula for Pythagoras' theorem for right angle triangles.
you can use pythagorean theroum. a squared plus b squared equal c squared (a^2+b^2=c^2) where a and b are the short and long sides and c is the hypotnuse
The Pythagoream Thereom is a^2 + b^2 = c^2. Written out it is a squared plus b squared equals c squared.