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