Lesson 1 Identify and Sort Shapes

    • Let’s sort and name shapes based on their sides and corners.

Warm-up Notice and Wonder: Groups of Shapes

What do you notice? What do you wonder?

Group of triangles varying in size, 3 shaded and 3 unshaded.
8 assorted shapes, 2 shaded and 6 unshaded.

Activity 1 Card Sort: Shapes

Sort the shapes into categories in a way that makes sense to you. Be prepared to explain how you sorted the shapes.

Activity 2 Penta-what?

Gather clues to find out what kind of shapes belong in each of these categories.





  1. Ask the teacher whether a shape card belongs with one of these categories.

    Use this question frame:

    Is Shape a ?

  2. Use the clues you gathered to make a true statement.

    Shape is a because it has

  3. Would these shapes belong to any of these categories? Explain.

    Shape. Five sides, not closed.
    Shape with 6 sides and 5 corners.
    Diagram. Shape with five sides. 4 straight sides, 1 curved.

Activity 3 Compare Shapes

Pick 1 shape card.

Be prepared to name and describe your shape to a partner.

Practice Problem

Problem 1

Here are some shapes.

Assorted shapes.
  • Find a triangle and label it A. Explain why the shape is a triangle.

  • Find a pentagon and label it B. Explain why the shape is a pentagon.