I’m not sure what problem your asking about, but I do know that a square+b square=c square. If you already have c, multiply it by itself to get c square. Then if you already have a OR b, not both, then find a square or b square depending on which you have (a by a OR b by b) THEN SUBTRACT, C SQUARE MINUS B SAUARE IR A SQUARE DEPENDING ON WHICH YOU HAVE TO GET A OR B SQUARE depending on which you have. Then find the square root and you are done!!!