A circular garden is designed within a rectangular park. The rectangular park has dimensions of 50 meters in length and 30 meters in width. The diameter of the circular garden is intended to be 20 meters. However, due to a design change, the diameter is increased by 10 meters. This new arrangement requires that the garden is positioned so that it is tangent to one side of the rectangle and the center of the circle aligns perfectly with the center of the rectangle.
What is the area of the circular garden after the diameter increase?