You want to build a running track as shown in the drawing. The requirements that they ask the construction engineer is that the track (perimeter) of the same measure 200 meters, and that the interior...

You want to build a running track as shown in the drawing. The requirements that they ask the construction engineer is that the track (perimeter) of the same measure 200 meters, and that the interior area, which will be used for complementary warm-up activities and location of coaches, has the largest possible area. What must the dimensions of the track (h and x) to meet these conditions?