Difference between revisions of "Angle sum property of a Triangle"

From Karnataka Open Educational Resources
Jump to navigation Jump to search
Line 23: Line 23:
 
# In a triangle, if the sum of two angles is 60°, then what will be the measure of third angle?
 
# 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?
 
# If a triangle has all three angles are equal in measure, then what will the measure of each angle?
Go back to the page - [[KVS Triangles|click here]]
+
Go back to the page - [https://karnatakaeducation.org.in/KOER/en/index.php/Triangles?veaction=edit&section=20 click here]

Revision as of 14:12, 19 December 2020

Objectives

Estimated Time

Prerequisites/Instructions, prior preparations, if any

Materials/ Resources needed

Click here to open the file

Process (How to do the activity)


Download this geogebra file from this link.


  • 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

  1. In a triangle, if the sum of two angles is 60°, then what will be the measure of third angle?
  2. If a triangle has all three angles are equal in measure, then what will the measure of each angle?

Go back to the page - click here