Problem 510: Triangle, Three Squares, Midpoints, Concurrency, Mind Map. Level: High School, College, SAT Prep. The drawing shows the squares ABDE, BCFG, and ACHJ. The points K, M, and N are the midpoint of EJ, DG, and FH, respectively. Prove that KA, MB, and NC are concurrent at a point P.      Mind Map: "How to Solve It, A new aspect of Mathematical Method" George Pólya's 1945 book "How to Solve It, A new aspect of Mathematical Method", is a book describing methods of problem solving. It suggests the following steps when solving a mathematical problem: (1) First, you have to understand the problem. (2) After understanding, then make a plan. (3) Carry out the plan. (4) Look back on your work. How could it be better?    Mind Map Help. To see a note: Hover over a yellow note button. To Fold/Unfold: click a branch. To Pan: click and drag the map canvas. Problem Solving. Activate Flash plugin or Javascript and reload to view the Mind Map of How to Solve It, Interactive Mind Map, Elearning. Recent Additions