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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.




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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