Quadrilateral Post author By Rik D. Tangerman Post date October 27, 2020 No Comments on Quadrilateral A quadrilateral is a polygon with four vertices and four sides. ← Isosceles → Unit circle Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ Optionally add an image (JPEG only)