You can use circles or other shapes to make a Venn Diagram.
When students compare and contrast, they observe the similarities and differences between things. The Venn Diagram shows how things are alike and how they are different.
A Venn Diagram is made with two (or more) overlapping circles. Each circle is called a set. The intersection where 2 sets overlap, is where students write the characteristics that the things have in common. To the right and left of the overlapping area is where students list the differing characteristics of the things.
The students could compare/contrast the characteristics of 2D and 3D Shapes and thus demonstrate their understanding of how these shapes are alike and how they are different.
The students could draw the Venn Diagrams in their Mathematics Notebook or you could download one of the FREE Venn Diagram Worksheets from my website (Learning Workroom).
Go to Free Worksheets
Have fun with math!