Question 999126: why might your measurements of the hypotenuse on a right triangle be different than the the length you found using the Pythagorean Theorem?
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! Measurement error, if this is a real-world situation. A 3,4,5 right triangle has to have everything measured appropriately, including the right angle.
Non-plane geometry, like spherical trigonometry, where the angles add to more than 180 degrees.
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