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Lesson template 
Name of the teacher: Sai Priya S 
Subject : Mathematics 
Unit : Similar Triangles 
Topic : Concept of similarity 
Focus 
To make the students understand the concept of similarity and to teach 
them how to cultivate the talent of solving similarity problems. 
Social system 
To teach the students about the concept of similarity, the teacher shows 
the students some shapes as examples. Students observe the shapes and 
group them. From that they come into the conclusion of the concept and 
thereby solving the problems related to similarity. 
Principles of reaction 
With the help of observing the students and grouping them accordingly the 
teacher makes the students understand the concept of similarity. 
Support system 
Shapes, coins, textbook etc.
Classroom Interaction Procedure 
Phase I: Collection and observation 
The teacher displays some shapes to the students and asks them 
to observe. Later, asking them to group the shapes. 
Responses
Classroom 
Interaction 
Procedure 
Phase II: 
Classification 
The teacher 
asks the 
students to 
group these 
shapes. 
Responses 
Stage I 
A B
Classroom 
Interaction 
Procedure 
Again the 
teacher asks 
the students 
to group the 
shapes in 
both A and B. 
Responses 
Stage II 
A B C D E F
Classroom 
Interaction 
Procedure 
Teacher asks 
the students 
to group the 
shapes with 
similar shape 
but different 
size. 
Responses 
Stage III 
A B C D E F
Classroom Interaction Procedure 
Phase III: Suggesting the basis of 
classification 
Teacher asks the students on what basis the 
three stages are been grouped. 
Phase IV: Developing facts 
Teacher ask the students to identify the 
speciality of A, B, C, D etc from stage III. 
Phase V: Concept formation 
Therefore, such shaped or 3-D figures which 
have the same shape but different size is said 
to be similar in nature. 
Responses 
Stage I 
Grouped as shapes and 3-D 
figures. 
Stage II 
Grouped as similar shapes 
Stage III 
Grouped as similar shapes but 
different sizes. 
1. Same shapes or 3-D figures 
2. Similar shapes 
3. Different sizes
Classroom Interaction Procedure 
So how can we conclude the concept of 
similarity? 
Phase VI: Problem solving 
The teacher asks the students the following 
question. 
Which of these are similar? 
Responses 
Two geometrical objects are said 
to be similar if they both have the 
same shape, or one has the same 
shape as the mirror image of the 
other.
Follow up activity 
1. Find out 4 sets of similar shapes from the nature? 
2. Using a scale, find out these two hexagons are similar?

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Lesson template

  • 1. Lesson template Name of the teacher: Sai Priya S Subject : Mathematics Unit : Similar Triangles Topic : Concept of similarity Focus To make the students understand the concept of similarity and to teach them how to cultivate the talent of solving similarity problems. Social system To teach the students about the concept of similarity, the teacher shows the students some shapes as examples. Students observe the shapes and group them. From that they come into the conclusion of the concept and thereby solving the problems related to similarity. Principles of reaction With the help of observing the students and grouping them accordingly the teacher makes the students understand the concept of similarity. Support system Shapes, coins, textbook etc.
  • 2. Classroom Interaction Procedure Phase I: Collection and observation The teacher displays some shapes to the students and asks them to observe. Later, asking them to group the shapes. Responses
  • 3. Classroom Interaction Procedure Phase II: Classification The teacher asks the students to group these shapes. Responses Stage I A B
  • 4. Classroom Interaction Procedure Again the teacher asks the students to group the shapes in both A and B. Responses Stage II A B C D E F
  • 5. Classroom Interaction Procedure Teacher asks the students to group the shapes with similar shape but different size. Responses Stage III A B C D E F
  • 6. Classroom Interaction Procedure Phase III: Suggesting the basis of classification Teacher asks the students on what basis the three stages are been grouped. Phase IV: Developing facts Teacher ask the students to identify the speciality of A, B, C, D etc from stage III. Phase V: Concept formation Therefore, such shaped or 3-D figures which have the same shape but different size is said to be similar in nature. Responses Stage I Grouped as shapes and 3-D figures. Stage II Grouped as similar shapes Stage III Grouped as similar shapes but different sizes. 1. Same shapes or 3-D figures 2. Similar shapes 3. Different sizes
  • 7. Classroom Interaction Procedure So how can we conclude the concept of similarity? Phase VI: Problem solving The teacher asks the students the following question. Which of these are similar? Responses Two geometrical objects are said to be similar if they both have the same shape, or one has the same shape as the mirror image of the other.
  • 8. Follow up activity 1. Find out 4 sets of similar shapes from the nature? 2. Using a scale, find out these two hexagons are similar?