Introducing parallel lines

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Parallel lines are lines that are always the same distance apart. Because they are always the same distance from one another, parallel lines will never intersect.


Introduce parallel lines

Understand perpendicular distance between parallel lines

Estimated Time

20 minutes

Prerequisites/Instructions, prior preparations, if any

Prior knowledge of point, lines, angles, intersecting lines, vertically opposite angles

Materials/ Resources needed

  • Digital : Computer, geogebra application, projector.
  • Non digital : Worksheet and pencil.
  • Geogebra files : Parallellines-1.ggb

Download this geogebra file from this link.

Process (How to do the activity)

  • Prior hands on activity: Draw two lines which are parallel in the file to ask will these lines meet.
  • Use the file to seek the initial observations from children – if the lines will ever meet
  • Is it possible for two lines to never meet.
  • How do you know if they will meet at certain point?
  • Drag the screen on either sides to show the two lines never meet.
  • Inquire if measuring the distance between the two lines will determine if the lines will meet.
  • Plot two points on the lines and join them
  • Draw two parallel lines
  • What do you notice about these lines
  • Note the distance between the two lines
  • Introduce concept of transversal : Draw two lines with transversal – how can you say that the two lines are parallel.
  • For the parallel lines identify the interior region and exterior region.
  • Evaluation at the end of the activity