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From Karnataka Open Educational Resources
→Concept 3: Angle Sum Property
# Can a triangle be formed with a reflex angle.
# Can a triangle be formed with a reflex angle.
# Measure the angles for different triangle, recognize the types of angles and conclude the type of triangle.
# Measure the angles for different triangle, recognize the types of angles and conclude the type of triangle.
{| class="wikitable"
!Observation
!Angle 1 measure and
its Type
!Angle 2 measure and
its Type
!Angle 3 measure and
its Type
!What can you say about angles?
!Type of triangle formed
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|Triangle 1
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|Triangle 2
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|Triangle 3
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* '''Evaluation at the end of the activity'''
* '''Evaluation at the end of the activity'''
# Are children able to recognize the types of triangles based on the angles in a triangle.
# Are children able to recognize the types of triangles based on the angles in a triangle.
# 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?
# Children can record the values of the angles of a triangle in the worksheet
# Children can record the values of the angles of a triangle in the worksheet
{| class="wikitable"
!Observation
!Angle 1
!Angle 2
!Angle 3
!Angle 1 + Angle 2 + Angle 3
!What can you say about sum of angles?
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# With the file – “7c. Angle sum property of a triangle.ggb”
# With the file – “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.
# Students should be able to identify the two angles moving are corresponding angles as the line moving is parallel to one of the sides.
# Students should be able to identify the two angles moving are corresponding angles as the line moving is parallel to one of the sides.
# Students can see that when the three angles of the triangle are placed adjacent to each other they form a straight line.
# Students can see that when the three angles of the triangle are placed adjacent to each other they form a straight line.
* 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>?
Work sheet
Work sheet
{| class="wikitable"
!Triangle
!Angle A
!Angle B
!Angle C
!Exterior angle
!Angle A + Angle B
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|Triangle1
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|Triangle2
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|Triangle3
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* Evaluation at the end of the activity 1. Have the students able to identify the relation between exterior and interior opposite angles of a triangle?
* Evaluation at the end of the activity 1. Have the students able to identify the relation between exterior and interior opposite angles of a triangle?
