Session 3, Part B:
Classifying Polygons

In This Part: Properties of Polygons | Grouping Polygons | Polygon-Classification Game
More Venn Diagrams

 You will now play a polygon classification game using Venn diagrams. Venn diagrams use circles to represent relationships among sets of objects. They are named after John Venn (1834-1923) of England. Venn, a priest and historian, published two books on logic in the 1880s. Venn diagrams can be used to solve certain types of logic puzzles.

 Problem B2 As a warm-up for the game, put each of the labels Regular, Concave, and Triangle next to one of the circles on the diagram. Place all the polygons in the correct regions of the diagram.

 As you're placing polygons in the labeled circles, think which properties each polygon has and then check whether that property is shared with any other of the labels. It might also be helpful to create a grid listing all the polygons and labels and filling it in for easier viewing of the shared properties among polygons.   Close Tip As you're placing polygons in the labeled circles, think which properties each polygon has and then check whether that property is shared with any other of the labels. It might also be helpful to create a grid listing all the polygons and labels and filling it in for easier viewing of the shared properties among polygons.

 Problem B3 See if you can determine the correct labels for each of the Venn diagrams in the following interactive activity: