Difference between revisions of "Triangles"
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# [[Elements of a triangle]] | # [[Elements of a triangle]] | ||
# [[Measures in triangle]] | # [[Measures in triangle]] | ||
− | # [[Interior and exterior angles in triangle]] | + | # [[Interior and exterior angles in triangle]] [[Category:Triangles]] [[Category:Class 9]] |
== Concept 2: Types of triangles based on sides and angles == | == Concept 2: Types of triangles based on sides and angles == | ||
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== Concept 3: Angle sum property == | == Concept 3: Angle sum property == | ||
− | === | + | === Activities === |
− | Angle sum property | + | # [[Angle sum property]] |
== Concept 4: Relation between interior and exterior angles in triangle == | == Concept 4: Relation between interior and exterior angles in triangle == | ||
− | === | + | === Activities === |
+ | # [[Relation between interior and exterior angles in triangle]] |
Revision as of 06:40, 12 April 2019
Concept Map
Additional Resources
OER
- Web resources:
- Bright Hub Education - Basic concepts of triangles,Types of triangles,Angle sum property,Exterior and interior angle relation
- Folioz - Inequalities in triangle, Investigate the relationship between the sides and angles in a triangle
- JsunilTutorial - Test papers for triangles
- Books and journals
- Textbooks
- NCERT Textbooks – Class 9
- Karnataka Govt Text book – Class 8
- Syllabus documents
Non-OER
- Web resources:
CPALMS -Introduction to triangles as a closed three sided figure,Inequalities in 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
- Elements of a triangle
- Measures in triangle
- Interior and exterior angles in triangle
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.