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

Name of the activity

Brief blurb describing what the activity. If this has been borrowed from some external web site (for example, a non OER or OER site which had this idea and based on which the activity was developed)

Objectives

To understand if two adjacent angles form 180^o 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”

Download this geogebra file from this link.

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.

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