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Line 24: − + − + − * Classifying types of triangles − * Recognize the angle sum property − * Establish relation between interior and exterior angles − − ==== 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. − + − # [[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. [[Category:Triangles]]+ − [[Category:Class 8]]+ − − == 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 90<sup>o</sup>. − − − '''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. − − == Concept 3: Angle sum property == − − === Activities === − # [[Angle sum property]]: − − == Concept 4: Relation between interior and exterior angles in triangle == − − === Activities === − # [[Relation between interior and exterior angles in triangle]]
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===Learning Objectives===
===Learning Objectives===
* Identify a triangle
* To understand why we should History?
* Recognize interior and exterior angles
* Recognize the importance of studying History.
===Teaching Outlines===
===Teaching Outlines===
===== Activities =====
===== Activities =====
# [[Formation of a triangle]]: A plane figure formed by three intersecting lines.
# Students can learn about the history from their grand parents or elders in their families. They can make a chart of the events based on their learning.
# Students can make family tree taking help from their parents.
# Students can learn how different professions have evolved over time from the elders in family or from their teachers.
[[Category:History]]
[[Category:Class 11]]
# Obtuse triangles are triangles in which the measure of one angle is greater than 90<sup>o</sup>.
# Right triangles are triangles in which the measure of one angle equals 90 degrees.