Activity
Mr. Martini's Classroom

Mr. Martini's Classroom: Teacher's Figure Library: Geometric Figures

For Students 3rd - 8th Standards
This interactive resource provides an example picture of the geometric figure chosen by students to review.
Handout
Wolfram Research

Wolfram Math World: Squares

For Students 9th - 10th Standards
MathWorld provides multiple definitions and formulas for the mathematical term, square.