Question 384134
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Hi
Note: with a 45-45-90 triangle: the ratio of the Hypotenuse/leg is {{{ sqrt(2)/1}}}
x is the hypotenuse: 
  {{{ x/(7*sqrt(2)) = sqrt(2)/1}}}
cross multiply to solve for x
   x = 7*2 = 14, the length of the hypotenuse

CHECKING our Answer using Pythagorean Theorem
 49*2 + 49*2 = 98 + 98 = 196 = 14^2