First, fine the area of the triangular shape. Since you can see that the length of the rectangular shape is 6 yards, you know that the base of the triangle is 3 yards. Next, you would multiply 3 yards times 5 yards, and divide by 2. So the area of the triangular shape would be 7.5 yards.
Next, you have to find the area of the rectangle. The formula is 4 yards times 6 yards, which would be 24 yards. If you add 7.5 to 24, you get 31.5 yards, which is your answer.