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Relation between interior and exterior angles in triangle (view source)

Revision as of 10:37, 26 April 2019

123 bytes added ,  10:37, 26 April 2019
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An exterior angle of the triangle is the angle between one side of a triangle and the extension of an adjacent side. Exterior angle of the triangle has a relation with interiors of the triangle.
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Interior angle and the corresponding angle form a linear pair. This exterior angle in relation to the remote interior angles and their dependencies are deducted with the theorem.
    
=== Objectives ===
 
=== Objectives ===
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===Estimated Time===
 
===Estimated Time===
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40 minutes
    
=== Prerequisites/Instructions, prior preparations, if any ===
 
=== Prerequisites/Instructions, prior preparations, if any ===
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*Non digital : Worksheet and pencil.
 
*Non digital : Worksheet and pencil.
 
*Geogebra files :
 
*Geogebra files :
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*#'''“[https://ggbm.at/a33ygakp 8a. EA= Sum of opposite IAs in a triangle proof.ggb]” ,'''
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*#'''“[https://ggbm.at/dqxt4jb3 a. EA= Sum of opposite IAs in a triangle proof.ggb]” ,'''
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*#'''“[https://ggbm.at/rq7tx8kn 8b. EA= Sum of opposite IAs in a triangle.ggb]” ,'''
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*#'''“[https://ggbm.at/ytruqndh b. EA= Sum of opposite IAs in a triangle.ggb]” ,'''
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*#'''“[https://ggbm.at/gjwtzucu 8c. EA= Sum of opposite IAs in a triangle demo.ggb]”'''
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*#'''“[https://ggbm.at/bt4qsh42 c. EA= Sum of opposite IAs in a triangle demo.ggb]”'''
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{{Geogebra|yweqm6bj}}{{Geogebra|ytruqndh}}{{Geogebra|bt4qsh42}}
 
===Process (How to do the activity)===
 
===Process (How to do the activity)===
 
*In the triangle students should identify the angles of the triangle.
 
*In the triangle students should identify the angles of the triangle.
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*The other two files can be used to demonstrate the the relation between the exterior angle and opposite interior angles.
 
*The other two files can be used to demonstrate the the relation between the exterior angle and opposite interior angles.
 
*Note the measure of angles
 
*Note the measure of angles
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* {| class="wikitable" !Triangle !Angle A !Angle B !Angle C !Exterior angle !Angle A + Angle B |- |Triangle1 | | | | | |- |Triangle2 | | | | | |- |Triangle3 | | | | | |}
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{| class="wikitable"
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!Triangle
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!Angle A
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!Angle B
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!Angle C
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!Exterior angle
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!Angle A + Angle B
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|-
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|Triangle1
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|-
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|Triangle2
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|-
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|Triangle3
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|}
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'''Evaluation at the end of the activity'''
 
'''Evaluation at the end of the activity'''
 
* Have the students able to identify the relation between  exterior and interior opposite angles of a triangle?
 
* Have the students able to identify the relation between  exterior and interior opposite angles of a triangle?
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[[Category:Triangles]]
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[[Category:Class 8]]
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[[Category:Classroom activities]]
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