Given that is a rectangle, is a square, , and , calculate the area of the shaded part.
David parked his rectangular car in an empty rectangular parking lot. The dimensions of the parking lot are 87 feet by 83 feet and the dimensions of the car are 18 feet by 8 feet. What area of the parking lot is still empty?
The figure shows a square with length 3 yards inside a rectangle. Determine the area of the shaded part.