The SA= 128
First find the areas of each shape. So the area for both triangles (a=(b•h)/2) is equal to 20. The second triangle is also 20. 20+20=40.
Now for the rectangles (a=bh), so multiply each height by the base of 4. You end up getting 20, 32, and 36. Now add all those up: 20+32+36+40=128
