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

Revision as of 11:26, 30 May 2019

Two adjacent angles are said to be form a linear pair of angles, if their non-common arms are two opposite rays. Linear pair axiom of theorems are if a ray stands on a line , then the sum of two adjacent angles so formed is 180 degree

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”

Download this geogebra file from this link.

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 180^o angle
Do the two angles form a linear pair
Record the values of the two angles for various positions of point C

Sl No.	∠BOA	∠BOC	∠COA	∠BOC + ∠COA	Dothe angles form a linear pair
.

Evaluation at the end of the activity

@@ Line 1: / Line 1: @@
-===Name of the activity===
+'''Two adjacent angles''' are said to be '''form''' a '''linear pair''' of '''angles''', '''if''' their non-common arms are '''two''' opposite rays. '''Linear pair axiom''' of theorems are '''if a ray stands on a line''' , '''then the sum of two adjacent angles so formed is 180 degree'''
-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 ===