# Introducing formation of angle

From Karnataka Open Educational Resources

The standard angle concept based on the relative inclination of two lines meeting at a point irrespective of length of arms is discussed in an exploratory method.

### Objectives

- Introduce children to the concept of angle
- To introduce measure of angles
- Methods of measuring angles

### Estimated Time

30 minutes

### Prerequisites/Instructions, prior preparations, if any

- Digital : Computer, geogebra application, projector.
- Non digital : Worksheet and pencil.
- Geogebra files : "Introduction to angle formation”

Download this geogebra file from this link.

### Materials/ Resources needed

- Digital : Computer, geogebra application, projector.
- Non digital : Worksheet and pencil.
- Geogebra files : "Introduction to angle formation”

### Process (How to do the activity)

Prior hands on activity (optional – children can use two pieces of thread to move around a fixed point or two sticks tied with a thread).

**-Formation of angle**

- Use the file to demonstrate formation of angle
- Ask how segments rotation changes angle
- Ask how many angles are formed

**-Measure angles**

- How do you measure this angle
- Measure both angles as the children say
- Ask if there is any difference in the angle measures
- Mention the convention of clockwise/anticlockwise measurement
- Mention reflex/exterior angle
- Is there a relation between the two angles measured

**-Angle measure independent of segment length**

- Does the angle depend on the segment length – drag the line segments to show.

**Evaluation at the end of the activity**

- What are the different types of angles?
- When two segments are joined at a point how many angles are formed?
- What is the measure of the total angle formed at a point is?
- What is the convention used to measure angles?