1. The problem statement, all variables and given/known data Inside of a square ABCD exists a point M such that |MA|=7 cm, |MB|=13 cm and |MC| = 17 cm. Calculate the area of the square 2. Relevant equations 3. The attempt at a solution After a lot of formula searching I went and looked at the solution, there they proved that the point M i on the diagonal AC using the coordinate system and from there on it is easy to find the area. I need help in understanding the proof. They mentioned it is possible to do it using Pythagorean therorem but they didn't show how to do it and I don't see it. You can see my sketch in the picture. I know I am supposed to show my work and I have nothing to show, but can you at least give me some guidelines please?