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Line 1: − The angle sum property of a triangle states that the angles of a triangle always add up to 180°. Every triangle has three angles and whether it is an acute, obtuse, or right triangle, the angles sum to 180°+ Line 13:
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removed Category:Classroom activities using HotCat
Interior angles of a triangle are in relation and also determine the type of angles that can forms a triangle. This also helps in determining an unknown angle measurement.
===Objectives===
===Objectives===
*Non digital : Worksheet and pencil.
*Non digital : Worksheet and pencil.
*Geogebra files :
*Geogebra files :
*#'''“[https://ggbm.at/wjdsrz4w 7a. Angles in a right triangle.ggb]” ,'''
*#'''“[https://ggbm.at/n8xcdff9 a. Angles in a right triangle.ggb]” ,'''
*#'''“[https://ggbm.at/a2jjgpkn 7b. Angle sum property proof.ggb]” ,'''
*#'''“[https://ggbm.at/zwcggpwg b. Angle sum property proof.ggb]” ,'''
*#'''“[https://ggbm.at/fskbjzxj 7c. Angle sum property of a triangle.ggb]”'''
*#'''“[https://ggbm.at/HjfczzyE c. Angle sum property of a triangle.ggb]”'''
===Process (How to do the activity)===
===Process (How to do the activity)===
*Use the file - “[https://ggbm.at/wjdsrz4w 7a. Angles in a right triangle.ggb]”
{{Geogebra|n8xcdff9}}
*Use the file - “[https://ggbm.at/wjdsrz4w a.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 - “[https://ggbm.at/a2jjgpkn 7b. Angle sum property proof.ggb]”
{{Geogebra|zwcggpwg}}
*With the file - “[https://ggbm.at/a2jjgpkn b. 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?
!What can you say about sum of angles?
!What can you say about sum of angles?
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*With the file – “[https://ggbm.at/fskbjzxj 7c. Angle sum property of a triangle.ggb]”
{{Geogebra|HjfczzyE}}
*With the file – “[https://ggbm.at/fskbjzxj c. 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?
'''Evaluation at the end of the activity'''
'''Evaluation at the end of the activity'''
* Have students able to conclude if the sum of angles in any triangle is 180<sup>o</sup>?
* Have students able to conclude if the sum of angles in any triangle is 180<sup>o</sup>?
[[Category:Triangles]]
[[Category:Class 8]]