How Can You Tell?

This is a circle. (point to a circle)
How can you tell?
It goes round and round,
No end can be found.
This is a square. (point to a square)
How can you tell?
It has four sides,
All the same size.

By Jeanne Petty.  From 1001 Rhymes & Fingerplays For Working with Young Children.  Totline Staff, comp. Everett, WA:  Warren Publishing House, Inc. 1994.