Point Park Points of Concurrency

Point Park is located in the city of Pittsburgh, Pennsylvania. In the center of the park are the remains of Fort Duquesne. (It is the star-looking figure in the center.) Drag the points H, G, and F around on the map to try to get the intersection point (point of concurrency) to land on Fort Duquesne. What do you notice about the segments and measures of the angles?