Adjacent angles

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Name of the activity

Brief blurb describing what the activity. If this has been borrowed from some external web site (for example, a non OER or OER site which had this idea and based on which the activity was developed)

Objectives

Introduce children to concept of adjacent angles

Estimated Time

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


Download this geogebra file from this link.


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