Question 224464
You need to use the formula:
{{{a^2+b^2=c^2}}}
The {{{a}}} and {{{b}}} represent the sides while {{{c}}} represents the  hypotenuse.
Plug in your known sides, square them and add them together. Then take the square root of that sum to solve for {{{c}}}.
{{{c=sqrt(a^2+b^2)}}}.
To get the perimeter you can then add up all three sides.