Lesson plan

Classifying 2-D Shapes

In this lesson your students will classify two-dimensional shapes using a Venn diagram based on their features.
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Students will be able to classify shapes based on their features.

(5 minutes)
  • Draw a three-ring Venn diagram with each ring assigned one of the following criteria: Four legs, fur, and two eyes. Discuss the criteria with your class and fill in the diagram with appropriate examples.
(5 minutes)
  • Explain how the Venn diagram’s function is to classify items based on criteria and ask, “What objects meet all three criteria?” Allow for responses and list a few items that qualify.
(5 minutes)
  • Hand out and preview the Categorize These Shapes! worksheet and categorize shape #1 with your students.
(15 minutes)
  • Answer any clarifying questions and have students complete the remaining exercises.

Enrichment: Students can create a two-ring Venn diagram poster with categories and shapes of their choice.

Support: Students can cross out items once sorted, as a concrete elimination strategy.

(5 minutes)
  • Assign the three rings a number and give your students a shape. Have them hold up numbers that go with the correct category. For instance, if parallelogram is designated as ring number one, students should hold up one finger if you were to say, “square.”
(10 minutes)
  • Review answers as a class and have students explain their reasoning.
  • Discuss the Connections question from the worksheet. Answers may vary, but a connection can be made a right angle being 90 degrees, is a defining characteristic for shape classification.

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