View source for Angle sum property of a Triangle

=== Objectives ===

=== Estimated Time ===

=== Prerequisites/Instructions, prior preparations, if any ===

=== Materials/ Resources needed ===
Click here to [[:File:Angle sum property of triangle.ggb|open]] the file

=== Process (How to do the activity) ===
{{Geogebra|xbwbcdgn}}
* Students should be able to recognize the corresponding angles formed when the parallel line is drawn.
* Students should be able to recognize the alternate angles formed. Is the alternate angle same as one of the angles of the triangle.
** 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?
** Is it parallel to one of the sides?
** What can you say about the pairs of angles – look at the matching colors.
** Once the parallel line reaches the vertex, how many angles are formed?
** 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.

=== Evaluation at the end of the activity ===
# In a triangle, if the sum of two angles is 60°, then what will be the measure of third angle?
# If a triangle has all three angles are equal in measure, then what will the measure of each angle?
Go back to the page - [https://karnatakaeducation.org.in/KOER/en/index.php/Triangles?veaction=edit&section=20 click here]