Slope of parallel and perpendicular lines

=Activity - Name of Activity= Parallel lines have the same slope and slope of perpendicular lines are the negative reciprocals of each other

Estimated Time
1 Hour

Materials/ Resources needed
Geogebra applet

Prerequisites/Instructions, if any

 * 1) Students should know that every line is a representation of an equation /relation between variables
 * 2) Graphing an equation/producing equation by visualising graph
 * 3) Students should know what is Slope?
 * 4) Similarity of two triangles

Process (How to do the activity)
Play with the following Geogebra applet

[From this geogebra applet we can visualise that slope of two parallel lines are same and slope of two perpendicular lise are negetive resiprocals of each other]

Developmental Questions (What discussion questions)

 * 1) Move the Blue points observe the changes
 * 2) record the Slopes of two lines
 * 3) Compare the values

Evaluation (Questions for assessment of the child)
Can we prove that the given triangle is Right angled triangle?

Activity Keywords
[Back to Co-ordinate geometry Page Link]