You can use pythagorean theorem twice to find the diagonal of a cube
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Yes Pythagoras' theorem can be used to find the interior diagonal of a cube for example.
pythagorean theorem was named from a greek mathemition called pythagorus (I think that's how you spell it)
Since the Pythagorean theorem has 3 variables (the 3 sides), and you only know one variable, you cannot use it to solve for the other 2 variables. Do you know any other information (like angles)? that can be used to solve the triangle (you would not be using the Pythagorean theorem, though). Did they mark the 2 legs with little 'tick marks' denoting that they are equal? Then you could use the Pythagorean theorem because then you know 2 varaibles, and you can solve for the third variable.
The difference in the distance formula and the pythagorean theorem is that the distance formula finds the distance between two points while the pythagorean theorem usually finds the hypotenuse of a right triangle.
Pythagoras