Question 590177
(1)
The pythagorean Theorem is about Right triangles
and no other kind.
(2)
A right triangle is one that has a 90 degree angle
(3)
It helps to picture, or better yet, draw what the
Pythagorean Theorem says.
It says that the square ON the hypotenuse is equal
to the sum of the squares ON the other 2 legs
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So, once you draw the squares on the 3 sides, the 
theorem say that if you add up the areas of the
2 smaller squares, it equals the area of the 
larger square.
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There are some whole number squares, like the
3-4-5 right triangle
{{{ 3^2 + 4^2 = 5^2 }}}
{{{ 9 + 16 = 25 }}}
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The theorem works in both directions:
If you've got a right triangle, the formula has to work
and if the formula works, you must have right triangle
Hope this helps