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All features that can be computed using points of a polygon

Hi, I am new to using OpenCV and pardon me if this has been asked before. I have a set of polygons in 2-D with their respective endpoints. I have started learning CV and finding out which features like roundness, area, perimeter, elliptic fit, etc.. can be computed using the inbuilt functions in CV.

Also, please suggest me any interesting features that can I can compute from a set of polygons of irregular sizes. (say one polygon has only 4 end points and another might have 10 endpoints and so on randomly).

Thanks for the help!!!