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From Karnataka Open Educational Resources
Exterior angle property of a Triangle (view source)
Revision as of 14:11, 19 December 2020
, 14:11, 19 December 2020→Evaluation at the end of the activity
=== Objectives ===
=== Objectives ===
To show that exterior angle of a triangle is equal to the sum of its interior opposite angles.
=== Estimated Time ===
=== Estimated Time ===
30 minutes
=== Prerequisites/Instructions, prior preparations, if any ===
=== Prerequisites/Instructions, prior preparations, if any ===
Knowledge about point, lines and angles, adjacent angles, alternate angles, corresponding angles, linear pair
=== Materials/ Resources needed ===
=== Materials/ Resources needed ===
Click here to [[:File:Exterior angle theorem of triangle.ggb|open]] the file
Digital : Click here to [[:File:Exterior angle theorem of triangle.ggb|open]] the file
Non-digital : Worksheet, pencil, ruler, compass, protractor
=== Process (How to do the activity) ===
=== Process (How to do the activity) ===
{{Geogebra|1=kxphjay3}}
{{Geogebra|1=kxphjay3}}'''Procedure:'''
# Draw triangle ABC
# Identify the angles of the triangle.
# What is the sum of the angles of a triangle?
# Extend one side, students should recognize the exterior angle formed.
# Measure the exterior angle of a triangle
# Identify interior opposite angles for the exterior angle of a triangle. Mark the angle in purple and green colour.
# Move the sliders and observe the changes.
# How are the two angles together related to the exterior angle?
# Do you notice any relation between the exterior angle and the interior angles
=== Evaluation at the end of the activity ===
=== Evaluation at the end of the activity ===
# What would be the measure of exterior angle for each vertex of an equilateral triangle?
# Does an exterior angle of a triangle is smaller than either of its interior opposite angles?
Go back to the page - [https://karnatakaeducation.org.in/KOER/en/index.php/Triangles?veaction=edit§ion=20 click here]
[[Category:Triangles]]
