Area of a square is l x w=9x9=81
Area of a triangle is 1/2(bxh)=1/2(9x7)=31.5
As there r 4 triangles, multiply 31.5 by 4 to get the tot surface area of the triangles as 126.
Now add the square area to the triangles area for the total surface area.
126+81=207
D is the answer