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 -Measure angles -Angle measure independent of segment length Evaluation at the end of the activity
 * Use the file to demonstrate formation of angle
 * Ask how segments rotation changes angle
 * Ask how many angles are formed
 * 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
 * Does the angle depend on the segment length – drag the line segments to show.
 * 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?