Linear pair axiom : If a ray stands on a line, then the sum of two adjacent angles so formed is 180 degrees

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 linear pair of angles

Estimated Time
30 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 : “Linear pair axiom - ray on a line.ggb”

Process (How to do the activity)

 * Prior hands on activity
 * Start with coinciding point C with the point B
 * What is the angle formed by the line
 * Move point C above and slowly rotate around point 0
 * How many angles do you notice
 * Name the angles formed : what are their measure
 * Do the two angles together form a 180o angle
 * Do the two angles form a linear pair
 * Record the values of the two angles for various positions of point C


 * {| class="wikitable"


 * Sl No.
 * ∠BOA
 * ∠BOC
 * ∠COA
 * ∠BOC + ∠COA
 * Dothe angles form a linear pair
 * }
 * Evaluation at the end of the activity
 * }
 * Evaluation at the end of the activity
 * }
 * Evaluation at the end of the activity
 * }
 * Evaluation at the end of the activity
 * Evaluation at the end of the activity