Difference between revisions of "Triangles"
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===== Activities ===== | ===== Activities ===== | ||
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− | + | ====== [[Formation of a triangle]]: A plane figure formed by three intersecting lines. ====== | |
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− | + | ====== [[Elements of a triangle]]: Terms that are associated with triangle. ====== | |
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+ | ====== [[Measures in triangle]]: Parameters that are measured in a triangle. ====== | ||
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+ | ====== [[Interior and exterior angles in triangle]]: Angles formed when a triangle is formed. ====== | ||
+ | [[Category:Triangles]] | ||
[[Category:Class 8]] | [[Category:Class 8]] | ||
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===== Activities ===== | ===== Activities ===== | ||
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− | + | ====== [[Types of triangles based on sides]]: Triangles formed are dependent on measures of sides. ====== | |
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+ | ====== [[Types of triangles based on angles]]: Triangles formed are dependent on measures of angles. ====== | ||
==== Concept 3: Theorems and properties ==== | ==== Concept 3: Theorems and properties ==== | ||
===== Activities ===== | ===== Activities ===== | ||
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− | + | ====== [[Angle sum property]]: ====== | |
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+ | ====== [[Relation between interior and exterior angles in triangle]] ====== |
Revision as of 10:02, 18 April 2019
Concept Map
Additional Resources
OER
- Web resources:
- Wikipedia, the free encyclopedia : This gives comprehensive information on triangles from basics to in depth understanding of the topic.
- 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.
- Books and journals
- Textbooks
- NCERT Textbooks – Class 9
- Karnataka Govt Text book – Class 8
- Syllabus documents
Non-OER
- Web resources:
- 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.
- CPALMS : The website gives lesson plan, activities and worksheets associated with triangles.
- Books and journals
- Textbooks
- 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
- A triangle is a three sided closed figure.
- 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
Formation of a triangle: A plane figure formed by three intersecting lines.
Elements of a triangle: Terms that are associated with triangle.
Measures in triangle: Parameters that are measured in a triangle.
Interior and exterior angles in triangle: Angles formed when a triangle is formed.
Concept 2: Types of triangles based on sides and angles
Types of triangles based on angles in the triangle
- Acute triangles are triangles in which the measures of all three angles are less than 90o.
- Obtuse triangles are triangles in which the measure of one angle is greater than 90o.
- Right triangles are triangles in which the measure of one angle equals 90 degrees.
Types of triangles based on sides in the triangle
- Equilateral triangles are triangles in which all three sides are the same length.
- Isosceles triangles are triangles in which two of the sides are the same length.
- Scalene triangles are triangles in which none of the sides are the same length.