Objectives (5 minutes)

1. Introduce the concept of flat figures, explaining what they are and how they differ from spatial figures. Students should be able to identify and name different flat figures, such as squares, rectangles, triangles, circles, and hexagons.
2. Develop students' ability to observe shapes and patterns in their surroundings, encouraging them to identify and name the flat figures they encounter daily.
3. Initiate the process of classifying flat figures, guiding students to group them according to their common characteristics, such as the number of sides and vertices.

Secondary Objectives:

1. Stimulate students' curiosity about mathematics, presenting the content in a playful and interactive way.
2. Promote critical thinking and logical reasoning through observation, identification, and classification activities.

Introduction (10 - 15 minutes)

1. Recalling previous content: The teacher starts the lesson by recalling two important concepts that were covered in previous classes: what shapes are and what numbers are. He can do this by asking students to identify different shapes and numbers on objects around the classroom. This helps establish the foundation for introducing the new topic.

2. Problem situations: The teacher presents two simple situations that students may encounter in their daily lives. The first situation is: 'Imagine you are playing with a puzzle and need to separate the pieces into two groups: one with drawing shapes and another with geometric shapes. How would you do that?' The second situation is: 'You are in the kitchen, and your mother asks you to get two round plates and three rectangular plates. How do you know which plates to get?'

3. Contextualization: The teacher explains that flat figures are used in many real-life situations, such as in art, building construction, and game creation. He can show students examples of how flat figures are used in board games or in cartoons they watch.

4. Capturing students' attention: The teacher introduces the topic by asking two interesting questions: 'Did you know that all flat figures have names? Like a square or a circle? And did you know that all flat figures have something in common? They are all 'flat'! No, it doesn't mean they are boring, but rather that they have only two dimensions - length and width - and do not have height like the spatial figures we will see later. Let's find out more about this today!'

Development (20 - 25 minutes)

1. Theory presentation: The teacher introduces the concept of flat figures, explaining that they are shapes that have only two dimensions: length and width. He can draw examples of flat figures on the board, such as a square, a triangle, a circle, and a rectangle. Each figure is drawn and named as it is presented. The teacher can also distribute posters with these shapes so that students can see them up close.

2. Differentiation of flat and spatial figures: The teacher should clarify the difference between flat and spatial figures, explaining that spatial figures have three dimensions: length, width, and height. He can use examples in the classroom environment to make this distinction, such as a cube or a ball.

3. Identification of flat figures in the environment: The teacher should encourage students to look around the classroom and identify flat figures they see. They can point to rectangular windows, square tables, rectangular chalkboards, etc. This will help reinforce the concept of flat figures and show students how this concept applies to the real world.

4. Classification of flat figures: The teacher should guide students to group flat figures into different categories, such as those with four sides, those with three sides, and those without straight sides. This will help students begin to develop the skill of classification, which is an important mathematical skill.

5. Practical exercises: The teacher should then propose some practical exercises for students. For example, he can say: 'Draw a flat figure that has four straight sides.' or 'Draw a flat figure that does not have straight sides.' Students should then draw the requested figure in their notebooks. The teacher should walk around the room to check progress and clarify any doubts.

6. Memory game of flat figures: To make the lesson more fun and interactive, the teacher can propose the memory game of flat figures. He should draw each flat figure presented in the lesson twice on separate cards. Students, in groups, should then try to find the pairs of each figure. This game helps reinforce knowledge of flat figures and develop students' visual memory.

7. Theory review: To conclude the development stage, the teacher should briefly review the theory presented, reinforcing the main concepts and clarifying any doubts that may have arisen during practical activities.

Return (10 - 15 minutes)

1. Group discussion: The teacher should gather all students in a circle for a group discussion. Each group should present the solutions to the practical exercises and the memory game of flat figures. During the presentations, the teacher should encourage students to explain their answers and justify their choices. This helps promote communication and mathematical argumentation, essential skills for understanding the concept of flat figures.

2. Connecting theory with practice: After the presentations, the teacher should lead a conversation about how the activities carried out in the classroom relate to the theory presented. He can ask questions like: 'What figures did you find in the classroom? How did you classify them?' The goal is for students to feel capable of applying what they have learned in a practical and contextualized way.

3. Reflection on learning: The teacher should propose that students reflect for a minute on what they learned in the lesson. He can ask two simple questions to guide this reflection:

   • 'Which flat figure did you find easiest to identify and why?'
   • 'Which flat figure did you find most difficult to identify and why?'

   Students should silently think about their answers and then share them with the class. This helps consolidate learning, allowing students to identify their strengths and areas for improvement.

4. Teacher feedback: To conclude the lesson, the teacher should provide overall feedback on the class's performance. He can highlight students' achievements, praising their participation and correct solutions, and also point out areas that still need more attention and practice. The teacher should reinforce the importance of continuous effort and practice for the development of mathematical knowledge.

5. Extra materials suggestion: The teacher can suggest some extra materials for students to deepen their understanding of flat figures. This may include children's math books, educational games online, or activities to do at home. The teacher should remind students that these materials are optional but can be useful for reinforcing learning and making it more enjoyable.

6. Lesson closure: The teacher should end the lesson by thanking everyone for their participation and reinforcing the importance of what was learned. He can say: 'Congratulations to everyone for the great work today! Now, you are all experts in flat figures. Keep observing around you, and you will see that flat figures are everywhere. See you in the next lesson!'

Conclusion (5 - 10 minutes)

1. Lesson summary: The teacher concludes the lesson by summarizing the main points covered. He should recap what flat figures are, the difference between flat and spatial figures, the importance of observing and classifying flat figures in the environment, and the main flat figures presented (square, rectangle, triangle, circle, and hexagon).

2. Connection between theory, practice, and applications: The teacher should then explain how the lesson connected theory, practice, and applications. He can say: 'Today, we learned the theory about flat figures, then practiced identifying and classifying the flat figures we found in the classroom, and finally saw how flat figures are used in real situations. This helped us better understand the concept of flat figures and how it applies to our daily lives.'

3. Extra materials: The teacher should remind students of the extra materials that were suggested, encouraging them to explore these resources to deepen their understanding of flat figures. He can say: 'If you want to learn more about flat figures, I suggest you read children's math books, play educational games online, and do activities at home. These materials are a great way to continue learning and having fun at the same time.'

4. Importance of the subject: Finally, the teacher should emphasize the importance of the content learned. He can say: 'Flat figures are very important because they are all around us. When we look at a book, a building, a cartoon, we are seeing flat figures. Knowing how to identify and classify these figures helps us better understand the world around us. Additionally, learning about flat figures helps us develop important mathematical skills, such as observation, classification, and logical reasoning.'

5. Lesson closure: The teacher should end the lesson by thanking everyone for their participation and encouraging them to continue exploring the fascinating world of mathematics. He can say: 'Thank you all for participating in this lesson. I hope you had fun learning about flat figures. Remember, math is everywhere, so keep exploring and discovering new things. See you in the next lesson!'