Okay, well, the top triangle should be 144.5 sqft. (17x17)/2= 144.5. That's the easy one. I was getting sidetracked with the other shapes.
You can do simple math here because 17x17 tells you that the angle between them is 90 degrees. Just multiply to get the area of a 17x17 square, then divide by 2 to get half do that square.



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