I try to multiply the a to b and try to divide the a to c (hypotenuse) or i try to multiply the a to c
If a=b=1, then c = sqrt(2). This is a pythagorean triple. If you multiply each of those 3 numbers by k, then the equality holds.
For example, if I multiply each side by 7, then I get a=b=7*1 and c= 7*sqrt(2).
Based on your answers you do not seem to understand that a=b. On side a and on side b do you see the mark | on each of those two sides. That mark means that those sides are equal in length. So if you are given a, then you know b; if you are given b, then you know a. If you know a and b, then Pythagoras would know exactly what to do.