View source for Linear pair axiom : If a ray stands on a line, then the sum of two adjacent angles so formed is 180 degrees

Two adjacent angles are said to be form a linear pair of angles, if their non-common arms are two opposite rays. Linear pair axiom of theorems are if a ray stands on a line , then the sum of two adjacent angles so formed is 180 degree

=== Objectives ===
Introduce children to  linear pair of angles

===Estimated Time===
30 minutes

=== Prerequisites/Instructions, prior preparations, if any ===
Prior knowledge of point, lines, angles

===Materials/ Resources needed===
* Digital - Computer, geogebra application, projector.
* Non digital -worksheet and pencil.
* Geogebra files : “[https://ggbm.at/xzyjb3q4 Linear pair axiom - ray on a line.ggb]”
{{Geogebra|xzyjb3q4}}

===Process (How to do the activity)===
* Prior hands on activity 
* Start with coinciding point C with the point B
* What is the angle formed by the line
* Move point C above and slowly rotate around point 0
* How many angles do you notice
* Name the angles formed : what are their measure
* Do the two angles together form a 180<sup>o</sup> angle
* Do the two angles form a linear pair
* Record the values of the two angles for various positions of point C


: {| class="wikitable"
|Sl No.
|∠BOA
|∠BOC
|∠COA
|∠BOC + ∠COA
|Dothe angles form a linear pair
|-
|.
|
|
|
|
|
|}
* '''Evaluation at the end of the activity'''

[[Category:Lines and Angles]]