Changes

====OER====

====OER====

* Web resources:

* Web resources:

** [https://en.wikipedia.org/wiki/Triangle Wikipedia, the free encyclopedia] : This gives comprehensive information on triangles from basics to in depth understanding of the topic.

** [https://en.wikipedia.org/wiki/Triangle Wikipedia, the free encyclopedia] : The website gives a comprehensive information on triangles from basics to in depth understanding of the topic.

** [https://jsuniltutorial.weebly.com/ix-triangles.html cbsemathstudy.blogspot.com] : This 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.

** [https://jsuniltutorial.weebly.com/ix-triangles.html 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

* Books and journals

====Non-OER====

====Non-OER====

* Web resources:

* Web resources:

** [https://www.brighthubeducation.com/middle-school-math-lessons/39674-triangle-properties-and-angles/ Bright hub education] : This 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.

** [https://www.brighthubeducation.com/middle-school-math-lessons/39674-triangle-properties-and-angles/ 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.

** [http://www.cpalms.org/Public/PreviewResourceLesson/Preview/40261 CPALMS] : The website gives lesson plan, activities and worksheets associated with triangles.

** [http://www.cpalms.org/Public/PreviewResourceLesson/Preview/40261 CPALMS] : The website gives lesson plan, activities and worksheets associated with triangles.

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

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

# A triangle is a three sided closed figure.

Formation of a geometric shape with minimum number of lines is introduced.The key geometric concepts that are associated with it and its properties are elaborated.

# It is one of the basic shapes in geometry.

# It triangle is a polygon with three edges and three vertices.

# There are three angles in a triangle formed at the three vertices of the triangle.

# Interior and exterior angles in a triangle at a vertex, together form a linear pair.

===== Activities =====

===== Activities =====

==== Concept 2: Types of triangles based on sides and angles ====

==== Concept 2: Types of triangles based on sides and angles ====

'''Types of triangles based on angles in the triangle'''

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

# Right triangles are triangles in which the measure of one angle equals 90 degrees.

# Scalene triangles are triangles in which none of the sides are the same length.

 

===== Activities =====

===== Activities =====