Introducing formation of angle

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”

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?