Aboriginal Perspectives


Congruent 2D Shapes

Jessica Wesaquate


Shape and Space (3-D Objects and 2-D Shapes)

Grade Level:



Main Objective:

Students will describe the characteristics of 3-D objects and 2-D shapes, and analyze the relationships among them.

General Outcome:

Name, describe and construct a variety of 3-D objects and 2-D shapes.

Specific Outcomes:

  1. Build and rearrange a pattern, using a set of 2-D shapes.

  2. Match and make identical (congruent) 2-D shapes.


Activity One: birch bark biting samples, scissors, Ziploc bags

Activity Two: tessellations

Activity/lesson Ideas:

  1. Cut apart a birch bark biting print out. Place the assorted pieces into a Ziploc bag. Make enough Baggies for students to work in partner groups. When students are trying to put the birch bark biting back together, the rule is they cannot talk. Once the birch bark biting is assembled, have the partners discuss what clues they used to help decide how they would assemble the biting.

  2. Find some tessellations online and print off copies for the class. Have students fold them in half to make two congruent shapes. Students should explain why they are congruent. Ask students to try and fold the tessellation a different way. Can it still make two congruent shapes?