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 Concave:  If, when you join any two points inside a figure, the resulting line segment goes outside the figure, then the figure is concave. Also called nonconvex.

Medial Polygons: Investigate the characteristics of a polygon that is generated by connecting the midpoints of consecutive sides of a polygon.

Quadrilaterals Inscribed in Quadrilaterals: Explore properties of quadrilaterals constructed using the midpoint of given quadrilaterals.