You can
put this solution on YOUR website!Since you are given two sides of the triangle and you know that neither of the two are the hypotenuse.
You can say that either a=3 and b=4 or the other way where a=4 and b=3. Then by using the pythagorean theorem which states a^2+b^2=c^2 you will be able to get your answer.
So
(3)^2+(4)^2=c^2
9+16=c^2
25=c^2
Now by taking the square root of each side you get that c=+ - 5, but since you are dealing with lengths and you can't have a negative length, then c=5.