We can break this shape into three parts, the left triangle, the middle square, and the right triangle. The left triangle has area of 2 square units, because 1/2(2x2) is 2. The middle square has 4 square units because 2x2 is 4. The right triangle has 6 square units because 1/2(6x2) is 6.
Adding the area of all the parts we get 12 square units.
