# Adjacent angles

From Karnataka Open Educational Resources

Adjacent angles are two angles that have a common vertex and a common side. The vertex of an angle is the endpoint of the rays that form the sides of the angle.

### Objectives

Introduce children to concept of adjacent angles

### Estimated Time

20 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 :
**Adjacent angles.ggb**

Download this geogebra file from this link.

### Process (How to do the activity)

- Prior hands on activity (optional – children can use news paper strips to form angles and place them together and notice the resulting angle formed)
**.** - Change the measure of the angles – angle1 and angle 2 using the slider
- If the two angles are place next to each other , what will be formed
- Use the slider to place the angles next to each other
- What is the resulting angle formed due to the two angles
- What is the measure of the angle formed when the two are placed to each other
- Is there any other way to make the two angles adjacent
- Record the values of the two angles and their sum in the worksheet

Sl No. Angle ABC Angle DEF Angle ABC + Angle DEF Angle O Is the sum of two angles greater than Angle O .

**Evaluation at the end of the activity**