Introducing formation of angle

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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


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?