Which is a true statement about an isosceles right triangle?

Let [tex]l[/tex] be the length of a leg. Using the pythagorean theorem, the hypotenuse is
[tex]h = \sqrt{l^2+l^2}=\sqrt{2l^2}=l\sqrt{2}[/tex]
So, the hypotenuse is [tex]\sqrt{2}[/tex] times as long as either leg.