12.4 is the surface area, why? because 3 x 1 is 3, 2 x 2.2 is 4.4 for the triangles because the total amount of what you get for a triangle just split it in two so, and for the bigger rectangle 2 x 3 is 5 so add all of that together so 3 + 4.4 + 5
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Also I hope that helped
