So you can't just do the entire thing by itself, so what you do is find the section of one part.
So for those two bottom rectangles, you know that they are both 4in high(long/wide?) and you can see that they are 5 in long. So then do (4*5)*2 since there's two then you get 40. Now there's just the long rectangle.
It's 12 in long, because down below you can that it's 4+5+4= 12
And then divide 8 by 2, because the smaller rectangles are 4 in high and 8/4=2 and the 8/2=4 therefore do 4*12.
once you do that you get 48, and 48+40= 88
