Linear pair axiom : If the sum of two adjacent angles is 180 degrees, then the non-common arms of the angles form a line

Objectives
To understand if two adjacent angles form 180o angle then the non-common arms of the angles form a line

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 : “Linear pair axiom - two adjacent angles form a line.ggb”

Process (How to do the activity)

 * 1) Give inputs for the two angles – Angle 1 and Angle 2.
 * 2) What is the sum of the two angles?
 * 3) When do the non-common arm form a line?
 * 4) Record the value of Angle 1, Angle 2.


 * {| class="wikitable"


 * Sl No.
 * Angle 1
 * Angle 2
 * Angle 1 + Angle 2
 * Do the non-common arms form a line
 * }
 * Evaluation at the end of the activity
 * }
 * Evaluation at the end of the activity
 * }
 * Evaluation at the end of the activity