Triangles

Concept Map

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Additional Resources

OER

• Web resources:
  • Wikipedia, the free encyclopedia : The website gives a comprehensive information on triangles from basics to in depth understanding of the topic.
  • cbsemathstudy.blogspot.com : The website gives worksheets for the chapters that can be downloaded. Worksheets for other chapters can also be searched for which are listed based on class.

• Books and journals
• Textbooks
  • NCERT Textbooks – Class 9

• Syllabus documents

Non-OER

• Web resources:
  • Bright hub education : The website describes a lesson plan for introducing triangles and lists classroom problems at the end of the lesson that can be solved for better understanding.
  • CPALMS : The website gives lesson plan, activities and worksheets associated with triangles.
  • UrbanPro : This website gives downloaded worksheets for geometry construction.
  • AglaSem Schools : This website lists important questions for math constructions.

• Books and journals
• Textbooks:
  • Karnataka Govt Text book – Class 8 : Part 1 , Part 2
• Syllabus documents (CBSE, ICSE, IGCSE etc)

Learning Objectives

• Identifying a triangle and understanding its formation
• Recognizing all parameters related to triangles
• Understanding formation of triangles based on sides and angles
• Establishing relationship between parameters associated with triangles

Teaching Outlines

Concept 1: Formation of a triangle, elements of a triangle and its measures

Introducing formation of a shape with minimum number of lines and the space enclosed forms a geometric shape.The key geometric concepts that are associated with it and its properties are elaborated.

Concept 2: Types of triangles based on sides and angles

Triangles can be based on its elements such as sides and angles. Students are able to recognize these formations.

Concept 3: Theorems and properties

Properties of triangles are logically proved by deductive method. Relations ships between angles of a triangle when a triangle is formed are recognized and understood.

Concept 4: Construction of triangles

Constructing geometric shapes to precision using a scale and a compass helps in understanding of properties of the shape. Constructing geometric shapes with minimum number of parameters enhances thinking skills.

The following constructions are based on three essential parameters that are required for construction following the SSS, SAS and ASA theorems