Difference between revisions of "Formation of a triangle"

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Brief blurb describing what the activity. If this has been borrowed from some external web site (for example, a non OER or OER site which had this idea and based on which the activity was developed)
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Introducing formation of a shape with least number of lines and the space enclosed by these lines form a geometric shape.The key geometric concepts that are related with this are explained. 
 
 
 
=== Objectives ===
 
=== Objectives ===
#Understand formation of triangles
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*Understand formation of triangles
#Recognize elements of triangle
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*Recognize elements of triangle
#Introduce  concepts of exterior angle.
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*Introduce  concepts of exterior angle.
 
===Estimated Time===
 
===Estimated Time===
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30 minutes
  
 
=== Prerequisites/Instructions, prior preparations, if any ===
 
=== Prerequisites/Instructions, prior preparations, if any ===
Prior knowledge of point, lines, angles, parallel linesResources needed
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Prior knowledge of point, lines, angles, parallel lines
  
 
===Materials/ Resources needed===
 
===Materials/ Resources needed===
#Digital : Computer, geogebra application, projector.
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*Digital : Computer, geogebra application, projector.
#Non digital : Worksheet and pencil
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*Non digital : Worksheet and pencil
#Geogebra files :  '''“[https://www.geogebra.org/m/bwsvgqqg#material/z4h42k8z Introduction to a triangle.ggb]”'''
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*Geogebra files :  '''“[https://www.geogebra.org/m/kenedcfx Introduction to a triangle.ggb]”'''
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{{Geogebra|kenedcfx}}
  
 
===Process (How to do the activity)===
 
===Process (How to do the activity)===
#Use the geogebra file to illustrate.
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*Use the geogebra file to illustrate. The questions below will are used to interact with the geogebra sketch.  
#How many lines are there? Are the lines meeting?
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*How many lines are there? Are the lines meeting?
#Are the two lines parallel? How can you say they are parallel or not?
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*Are the two lines parallel? How can you say they are parallel or not?
#How many angles are formed at the point of intersection?
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*How many angles are formed at the point of intersection?
#What is the measure of the total angle at the point of intersection of two lines?
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*What is the measure of the total angle at the point of intersection of two lines?
#Of the four angles formed which of the angles are equal? What are they called?
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*Of the four angles formed which of the angles are equal? What are they called?
#Do the three intersecting lines enclose a space? How does it look? It is called a triangle.
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*Do the three intersecting lines enclose a space? How does it look? It is called a triangle.
#What are the points of intersection of these three lines called?
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*What are the points of intersection of these three lines called?
#The line segments forming the triangle are called sides.
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*The line segments forming the triangle are called sides.
#How many angles are formed when three lines intersect with each other?
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*How many angles are formed when three lines intersect with each other?
#How many angles are enclosed by the triangle?
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*How many angles are enclosed by the triangle?
 
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'''Evaluation at the end of the activity'''
Categories: (Subject) (Topic) (Sub-concept/topic) (Class 6) (Resource format)
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* Can there be a closed figure with less than three sides?
 
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* Can the vertices of the triangle be anywhere on a plane?
Example -  (Mathematics) (Triangle) (Area) (Perimeter) (Class 6) (Class 8) (Geogebra) (Video)
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* What will happen if the three vertices are collinear?
 
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[[Category:Triangles]]
[[Category:Mathematics]]
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[[Category:Class 8]]
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[[Category:Classroom activities]]

Latest revision as of 05:59, 10 May 2019

Introducing formation of a shape with least number of lines and the space enclosed by these lines form a geometric shape.The key geometric concepts that are related with this are explained.

Objectives

  • Understand formation of triangles
  • Recognize elements of triangle
  • Introduce concepts of exterior angle.

Estimated Time

30 minutes

Prerequisites/Instructions, prior preparations, if any

Prior knowledge of point, lines, angles, parallel lines

Materials/ Resources needed


Download this geogebra file from this link.


Process (How to do the activity)

  • Use the geogebra file to illustrate. The questions below will are used to interact with the geogebra sketch.
  • How many lines are there? Are the lines meeting?
  • Are the two lines parallel? How can you say they are parallel or not?
  • How many angles are formed at the point of intersection?
  • What is the measure of the total angle at the point of intersection of two lines?
  • Of the four angles formed which of the angles are equal? What are they called?
  • Do the three intersecting lines enclose a space? How does it look? It is called a triangle.
  • What are the points of intersection of these three lines called?
  • The line segments forming the triangle are called sides.
  • How many angles are formed when three lines intersect with each other?
  • How many angles are enclosed by the triangle?

Evaluation at the end of the activity

  • Can there be a closed figure with less than three sides?
  • Can the vertices of the triangle be anywhere on a plane?
  • What will happen if the three vertices are collinear?