Take it on in parts, there are three shapes. One triangle, Two squares.
Triangle= 1/2 base * height
Triangle= 1/2(20)(11)= 110yd^2
Rectangle 1= base*height
Rectangle 1: (8)(4)= 32yd^2
Rectangle 2= (7)(12)= 84yd^2
Then add them together to get 226yd^2