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

From Karnataka Open Educational Resources

## Contents

### 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)

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