Question 492126
The equation of the hypotenuse  for a 45 45 90 degree triangle is side =  s , and for the hypotenuse  is s{{{sqrt(2)}}}.
We are given the hypotenuse and need to find a side. We would divide the hypotenuse by {{{sqrt(2)}}} to obtain a side, or leg of the triangle.
7/{{{sqrt(2)}}} = approx 4.97. 
Cleomenius.