Quadrilaterals —Lesson Module

Adding to cart… The item has been added

Classifying Quadrilaterals by Line and Angle Properties


In this series of investigations, students will construct and use a plethora of Zometool models to develop a system of identifying, classifying, and relating types of quadrilaterals by their line and/or angle properties.

Throughout the module, students will learn to reason with differing geometric properties in an effort to better understand the types of and relationships between quadrilaterals that exist in structures all around us.        

This product is available for download only. 


Primary Content Knowledge/Ideas

Focal Practices


  • Quadrilaterals can be classified according to their line and angle properties (e.g., having parallel lines, having congruent sides or angles)

  • Major types of quadrilaterals: Parallelogram, Rhombus, Rectangle, Square, Kite, Trapezoid

  • Quadrilaterals can be classified in a hierarchy based on their line and/or angle properties. Properties belonging to a category quadrilateral (e.g., parallelogram) also belong to all subcategories (e.g,. rhombus, rectangle, square).


  • Students will identify and reason with relationships between lines and angle properties in quadrilaterals to develop a system of classifying quadrilaterals.

  • Students will utilize a variety of tools to visualize, construct, and explain the development of geometric relationships in quadrilaterals; ranging from rulers to protractors to Zometool models.

  • Students will communicate and justify mathematical reasoning.



Grade Levels 3-5
Recommended ages 8-11
File Size: 2.4 MB
Pages: 26
How can relationships between lines and angles be used to develop a system for identifying and classifying quadrilaterals?