Wednesday, January 27, 2010


During Math Workshop, we have been looking at shapes and determining whether a shape was a polygon or nonpolygon. We learned that two-dimensional shapes are split into those two major groups. All simple closed shapes with straight sides are polygons. Simple shapes are shapes with sides that don't cross each other. The students also encountered closed shapes that are not polygons. These shapes have all or some curved sides, such as a circle, ovals, or semicircles.

The students looked at different shapes and sorted them either by the number of sides or angles a shape had, or the type of sides. Have your child look at these pictures and tell you if they are polygons or nonpolygons.

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