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This question already has an answer here:

I have a image below, kinda hard to see but was wondering if anyone has seen this formula and what its from and how to use it.

thx

$$A=\frac{1}{2}\sum\limits_{i=0}^{n-1}(x_iy_{i+1}-x_{i+1}y_i)$$

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marked as duplicate by David K, Strants, Xander Henderson, Jose Arnaldo Bebita-Dris, José Carlos Santos Jul 19 '18 at 22:56

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    $\begingroup$ en.wikipedia.org/wiki/Shoelace_formula $\endgroup$ – tatan Jul 19 '18 at 4:03
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    $\begingroup$ The resolution of that image is terrible! In any case, you should never rely on images here when text/MathJax would suffice (except for specific geometric shapes to get ideas across). Visit this page for information on how to type with MathJax and $\LaTeX$ here. $\endgroup$ – JMoravitz Jul 19 '18 at 4:04
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    $\begingroup$ Could be helpful: MSE: Area of an irregular polygon. $\endgroup$ – Oleg567 Jul 19 '18 at 4:19

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