I can not imagine why you would need a "special" version. The plain vanilla version says that if the side of the square is length s then the length of a diagonal d is the hypotenuse of a right triangle with equal sides s.
d^2 = s^2 + s^2 = 2 s^2
so
d = s * sqrt (2)
or d is approximately 1.414 .... * s
Which special version of the Pythagorean Theorem can you use to find the length of any squares diagonal, d, using only the length of its side, 12 inches.
Please help been struggling with this for a long time
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