Pythagorean Theorem, a world heritage site.
Now we perogullo appears true, as unquestionable as the sea has water and soil is under our feet, but imagine the world before Pythagoras occurred to him to get a measure triangles and draw a conclusion.
I just feel great, okay, the sum of the squares of the legs gives the value of the hypotenuse squared and this can happen. To my knowledge, nobody has found a case that is not met, so perfect and so unchanging through time and in any space ... at least in the area we handle at our level. I hesitated on whether there may be some unknown space expansion, contraction, curvature, or any circumstance that land pull the theorem. As it is something that I can not check right now, I'll drop it and continue to express my great admiration for the geometric shape so dutiful to the precept.
And what has been helpful and we continue to be, would not know otherwise incalculable distances, calculations become much easier and clearer by simply applying the magic formula. I will not review them here and now, anyone who spend a little to the subject can verify the truth of what I write.
My students often ask me, as it reaches the subject, what it does "it", my answer is always the same: the Pythagorean theorem should be declared a world heritage site.
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