Lets split the net into 3 rectangles, one is the big one in the middle while the other two are the smaller protruding ones on top and on the bottom. The small rectangles have an area of 3*2 = 6 and the big rectangles have an area of 6(3+2+3+2) = 6*10 = 60. Adding these up we get 60 + 6*2 = 60+12 =72.
