This is an activity book on quadrilaterals. Use it for a take home project, extra credit, and classroom engagement. Use it in lieu of an assessment. Use it for a supplemental grade in geometry. It covers many facets concerning this geometric grouping or classification. There are fun activities, spot checks, research, mini-essays, and a quiz. There are famous quotations inserted, to give it a bit of a classical approach. Math history: There are 3 mysteries to solve on ancient mathematicians.