The area of the park is 1600 square yards.
To calculate the area of the park, we need to calculate the area of the rectangle and the right triangle separately, and then add them together.
Area of the rectangle:
Area of rectangle = length * width
= 40 yards * 30 yards
= 1200 square yards
Area of the right triangle:
Area of right triangle = 1/2 * base * height =
1/2 * 40 yards * 20 yards
= 400 square yards
Total area of the park:
Total area = area of rectangle + area of right triangle
= 1200 square yards + 400 square yards
= 1600 square yards
Therefore, the area of the park is 1600 square yards.