Lesson 5

Círculos y triángulos

Lesson Purpose

The purpose of this lesson is for students to identify, describe, and compare circles and triangles.

Lesson Narrative

Students are also introduced to the geometric terms circle and triangle. Students develop their intuitive understanding of circles and triangles. They may incorrectly identify shapes in this activity, such as identifying an oval as a circle. If this happens, acknowledge the similarities between the shapes (“Esta figura es curva como un círculo, pero no es un círculo” // “This shape is curved like a circle, but it is not a circle.”) As students sort examples and non-examples of triangles in the second activity, they continue to build their informal understanding of what a triangle is.

  • Representation
  • MLR8

Activity 2: Clasificación de triángulos

Learning Goals

Teacher Facing

  • Identify, describe, and compare circles and triangles.

Student Facing

  • Aprendamos los nombres de algunas figuras.

Required Materials

Required Preparation

Activity 1:

Each student needs at least 2 different colored crayons or colored pencils.

Activity 2:

  • Cut out triangle cards from the blackline master. Each group of 4 needs 1 set of cards.

Activity 3:

  • Gather materials from: 
    • Which One, Stage 1
    • Picture Books, Stages 1-3
    • Bingo, Stages 1 and 2
    • Shake and Spill, Stages 1 and 2

CCSS Standards

Lesson Timeline

Warm-up 10 min
Activity 1 10 min
Activity 2 15 min
Activity 3 20 min
Lesson Synthesis 5 min
Cool-down 0 min

Teacher Reflection Questions

How did students think of triangles as they came into the lesson? In what ways did their understanding of triangles change upon completing the lesson?

Print Formatted Materials

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Student Task Statements pdf docx
Lesson Cover Page pdf docx
Teacher Guide Log In
Teacher Presentation Materials pdf docx
Blackline Masters zip