Difference between revisions of "Triangles"
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* Establish relation between interior and exterior angles | * Establish relation between interior and exterior angles | ||
| − | ==Teaching Outlines== | + | ===Teaching Outlines=== |
| − | == 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. | # A triangle is a three sided closed figure. | ||
# It is one of the basic shapes in geometry. | # It is one of the basic shapes in geometry. | ||
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# Interior and exterior angles in a triangle at a vertex, together form a linear pair. | # Interior and exterior angles in a triangle at a vertex, together form a linear pair. | ||
| − | === Activities === | + | ===== Activities ===== |
# [[Formation of a triangle]]: A plane figure formed by three intersecting lines. | # [[Formation of a triangle]]: A plane figure formed by three intersecting lines. | ||
# [[Elements of a triangle]]: Terms that are associated with triangle. | # [[Elements of a triangle]]: Terms that are associated with triangle. | ||
# [[Measures in triangle]]: Parameters that are measured in a triangle. | # [[Measures in triangle]]: Parameters that are measured in a triangle. | ||
| − | # [[Interior and exterior angles in triangle]]: Angles formed when a triangle is formed. | + | # [[Interior and exterior angles in triangle]]: Angles formed when a triangle is formed. [[Category:Triangles]] |
[[Category:Class 8]] | [[Category:Class 8]] | ||
Revision as of 06:46, 16 April 2019
Concept Map
Additional Resources
OER
- Web resources:
- Books and journals
- Textbooks
- NCERT Textbooks – Class 9
- Karnataka Govt Text book – Class 8
- Syllabus documents
Non-OER
- Web resources:
- Basic concepts of triangles,Types of triangles,Angle sum property,Exterior and interior angle relation
- CPALMS -Introduction to triangles as a closed three sided figure,Inequalities in triangles
- Inequalities in triangle, Investigate the relationship between the sides and angles in a triangle
- Test papers for triangles
- Books and journals
- Textbooks
- Syllabus documents (CBSE, ICSE, IGCSE etc)
Learning Objectives
- Identify a triangle
- Recognize interior and exterior angles
- Classifying types of triangles
- Recognize the angle sum property
- Establish relation between interior and exterior angles
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.
Activities
- Types of triangles based on sides: Triangles formed are dependent on measures of sides.
- Types of triangles based on angles: Triangles formed are dependent on measures of angles.