Four points on the plane are vertices of three different quadrilaterals. How can this happen? – math.stackexchange.com 16:14 Posted by Unknown No Comments Four points on the plane are vertices of three different quadrilaterals. How can this happen? The problem is taken from "Kiselev's Geometry - Book I : Planimetry" At first, I thought it could be ... from Hot Questions - Stack Exchange OnStackOverflow via Blogspot Share this Unknown
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