Polygon Debate

One day, while learning about the properties of shapes, one of our third graders asked, “Is a half-circle a polygon?”  Thus began an investigation into the properties of a polygon. We decided that a polygon is something that…

1. Has more than 2 sides

2. Has straight lines

3. Is a closed shape

4. Does not cross lines

Mrs. E drew a star on the board and we had a debate as to whether it was a polygon or not- and it all came down to how Mrs E drew it!

Polygon No Polygon Yes

Test yourself on these ‘shapes’- which one(s) are polygons?

Polygon Quiz

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