The friend is wrong - According to the Pythagorean Theorm, if c is the hypotenuse and a and b are opposite sides then c^{2} = a^{2} + b^{2} if c=65 inches, a=16 inches and b = 63 inches, then 65^{2} =16 ^{2} + 63^{2} right hand side of the equation = 256 + 3969 = 4225 left hand side of the equation = 65^{2}= 4225 So we see, left hand side = right hand side Hence the theorm is proved.
