[social4i size="small" align="align-left"][This article was first published onOnline College Math Teacher, and kindly contributed toR-bloggers]. (You can report issue about the content on this pagehere)Want to share your content on R-bloggers?click hereif you have a blog, orhereif you don't.A quadrilateral is a polygon having four sides, four angles, and four vertices. A polygon means that the figure is a closed shape, meaning the last line segment connects back to the first one, effectively enclosing an area.We usually think of quadrilaterals as squares, rectangles, parallelograms, trapezoi
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