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From Karnataka Open Educational Resources
→Activity No # 6 : Types of triangles based on angles
# Digital : Computer, geogebra application, projector.
# Digital : Computer, geogebra application, projector.
# Non digital : Worksheet and pencil.
# Non digital : Worksheet and pencil.
# Geogebra files : “6. Types of triangle by angle.ggb”
# Geogebra files : “'''[https://ggbm.at/g9h76xu3 6. Types of triangle by angle.ggb]'''”
* '''How to do'''
* '''How to do'''
# Identify the angle types in the triangle.
# Identify the angle types in the triangle.
# Non digital : Worksheet and pencil.
# Non digital : Worksheet and pencil.
# Geogebra files :
# Geogebra files :
## '''“7a. Angles in a right triangle.ggb” ,'''
## '''“[https://ggbm.at/wjdsrz4w 7a. Angles in a right triangle.ggb]” ,'''
## '''“7b. Angle sum property proof.ggb” ,'''
## '''“[https://ggbm.at/a2jjgpkn 7b. Angle sum property proof.ggb]” ,'''
## '''“7c. Angle sum property of a triangle.ggb”'''
## '''“[https://ggbm.at/fskbjzxj 7c. Angle sum property of a triangle.ggb]”'''
* '''How to do'''
* '''How to do'''
# Use the file - “7a. Angles in a right triangle.ggb”
# Use the file - “[https://ggbm.at/wjdsrz4w 7a. Angles in a right triangle.ggb]”
# Ask students what is the kind of triangle they observe.
# Ask students what is the kind of triangle they observe.
# Draw a parallel line to the side containing the right angle through the opposite vertex by dragging point D along the x-axis
# Draw a parallel line to the side containing the right angle through the opposite vertex by dragging point D along the x-axis
# Students should be able to recognize the alternate angles formed. Is the alternate angle same as one of the angles of the triangle.
# Students should be able to recognize the alternate angles formed. Is the alternate angle same as one of the angles of the triangle.
# So what can you say about the all the angles of the triangle?
# So what can you say about the all the angles of the triangle?
# With the file - “7b. Angle sum property proof.ggb”
# With the file - “[https://ggbm.at/a2jjgpkn 7b. Angle sum property proof.ggb]”
# Draw a line perpendicular to a side passing through the opposite vertex. How many triangles are formed. What kinds of triangles are formed?
# Draw a line perpendicular to a side passing through the opposite vertex. How many triangles are formed. What kinds of triangles are formed?
# In each of the two triangles if on angle is 90<sup>o</sup>, what will be the sum of the other two angles. What is the sum of these angles?
# In each of the two triangles if on angle is 90<sup>o</sup>, what will be the sum of the other two angles. What is the sum of these angles?
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# With the file – “7c. Angle sum property of a triangle.ggb”
# With the file – “[https://ggbm.at/fskbjzxj 7c. Angle sum property of a triangle.ggb]”
# Ask students what happens when the three angles of the triangle are placed adjacent to each other.
# Ask students what happens when the three angles of the triangle are placed adjacent to each other.
# What can you say about the line drawn?
# What can you say about the line drawn?
# Non digital : Worksheet and pencil.
# Non digital : Worksheet and pencil.
# Geogebra files :
# Geogebra files :
## '''“8a. EA= Sum of opposite IAs in a triangle proof.ggb” ,'''
## '''“[https://ggbm.at/a33ygakp 8a. EA= Sum of opposite IAs in a triangle proof.ggb]” ,'''
## '''“8b. EA= Sum of opposite IAs in a triangle.ggb” ,'''
## '''“[https://ggbm.at/rq7tx8kn 8b. EA= Sum of opposite IAs in a triangle.ggb]” ,'''
## '''“8c. EA= Sum of opposite IAs in a triangle demo.ggb”'''
## '''“[https://ggbm.at/gjwtzucu 8c. EA= Sum of opposite IAs in a triangle demo.ggb]”'''
* '''How to do'''
* '''How to do'''
# In the triangle students should identify the angles of the triangle.
# In the triangle students should identify the angles of the triangle.
