Measuring sq footage of irregular shape wall?

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It's about 53 square feet. The picture isn't entirely accurate because I did some rounding, but I made it so you know I'm not pulling the number out of my ass

File: 1479519940123.png (49KB, 1112x754px) Image search: [Google]

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>>8482523
Are you sure these two points are level?

It doesn't square with OP's numbers, although that could be due to measurement errors.

File: 1479519940123.png (42KB, 1112x754px) Image search: [Google]

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>>8482523
>>8482530
Specifically this would make the legs on the little triangle 2.5 when from OP's diagram the hypotenuse, which should be longer, is 2.25. Which means either OP's measurements are not very accurate, or the points aren't level. Could be either, best to ask.

>>8482530
True, I didn't consider that. It looks like the right point is slightly higher.

Just use Pick's theorem.

>>8482540
I would assume that OP's measurements are workable. We'll see if he has anything to say if he ever comes back to the thread.

Any polygon can be broken down into a series of right triangles.

>>8482407
You can't do it mathematically. If you have just the lengths of the sides you could easily deform it into a different shape with a different area.

Best guess is draw it on mm-paper and measure.