Still use the Pythagorean theorem.
C2 + a2 + b2 ( c = hypotenuse )
c2 = 52 + [sqrt(2)]2
c = sqrt( 25 + 2)
c = sqrt(27)
================your hypotenuse in am exact answer.
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If the hypotenuse is the square root of three, then the legs are (root 6)/2. If the hypotenuse is 12, then the legs are 6(root 2). This is because, for any given right isosceles triangle, the length of the hypotenuse x is root two times the length of the legs.
A^2 + B^2 = C^2 2^2 + 2^2 = 8 The square root of 8 is not 4, so the hypotenuse can not be 4 inches.
If its a right angle triangle then the hypotenuse using Pythagoras 2 times the square root of 149
1.414 ie root 2
If it is a right angle isosceles triangle then by using Pythagoras' theorem its hypotenuse is 30 times the square root of 2