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Contreras, Jose N. – Mathematics Teacher, 2004
An exploration of nonconvex, crossed, and degenerate polygons (NCCDPs) are described with the help of examples with pedagogical tips and recommendations that are found useful when teaching the mathematical process of extending geometric patterns to NCCDPs. The study concludes that investigating such extensions with interactive geometry software…
Descriptors: Geometric Concepts, Plane Geometry, Mathematics Instruction, Teaching Methods