Legs each have a length of 10 units what is the length of the hypotenuse of the triangl

Use a^2+b^2=c^2 so 10^2+10^2=c^2 which is 200=c^2 and you could leave it in sqrt form so c=sqrt (200) or you can simplify it to 10sqrt (2) or you can approx the answer which is 14.14