Question 472452
Do you mean 45 degs between the 2 equal sides?  If so,
the 3rd side is 2*2*sin(22.5) =~ 1.53 ft
------------
If you mean the two short sides are 2 ft and the angle between them is 90 degs,
then the hypotenuse is 2*sqrt(2) =~ 2.828 feet.