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

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

### 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