A blog about teaching and learning in a maths classroom.

Using GeoGebra

Wednesday, 22 July 2009 | 1 Comment

This article is not a “how-to” but rather some thinking about using GeoGebra (a discussion starter maybe).

GeoGebra logo

As noted previously, I went to a GeoGebra course the other day.  There was lots of how-to in the course, but the one disappointing part was the small amount of discussion of using this software in class.  I think that would have been of greater benefit.  I see a lot of teachers getting excited about widgets rather than thinking about how they will use them with a class.  Maybe they are thinking about it, but just not talking about it or sharing what they are doing…  It seemed the same with this GeoGebra course.

There was brief discussion, but it came down to this one point I wrote on Twitter:

The major point from a GeoGebra (Maths apps on #dernsw laptops) course with other teachers - we really need data projectors in classrooms.

Aside from the need for data projectors in our classrooms, here are some of the ways I can see GeoGebra being used in the classroom.  I’m thinking about this in terms of looking at angles created by a transversal cutting parallel lines – it was a topic I had just taught before going to this course.


Using GeoGebra to demonstrate a concept seems to be the most obvious application.  Widgets to demonstrate the angle properties when a transversal cuts parallel lines can be whipped up in minutes (alternate, corresponding, cointerior).  These,  would be teacher led, although with their own laptops, obviously the students could play with them as well.

How is this better to doing a paper-based activity?  For starters, the measuring is accurate – you know the problem, students measure the angles in a triangle to discover they add to 179°!  Also, not being a static representation, students can see that the property holds for various lines, triangles etc.


A step-up from Demonstration might be to make a simpler GeoGebra file (or even get them to create it from scratch*) with just the parallel lines and a transversal, and get them to either 1. measure pairs of angles you point out, or 2. to work blindly until they find relationships between pairs of angles.  Not sure of the effectiveness of that though, certainly I would need to provide a scaffold to my classes.

*Side note: there also needs to be some discussion about the benefits of students learning to construct things in GeoGebra.


One way I’ve used dynamic geometry in the past was to create a one lesson consolidation activity, where students construct or used pre-constructed objects to investigate properties.

Extra thoughts that aren’t really conclusions, because I haven’t concluded anything yet

First up, when it comes down to it, technology is an extra.  As this poll suggests, good teaching can happen without technology, but as the second poll points out, we need to be using technology.  GeoGebra is a great tool to supplement and extend existing teaching and learning.

To answer my own side note above about the benefits of students learning to construct things in GeoGebra.  I think we need to teach how to use GeoGebra for construction, because it provides the students with another tool to use outside of class, to construct and investigate in their own time.

How do we use GeoGeobra in the classroom without a projector?  With difficulty.

This post is not quite what I envisaged when I set out, but it has been written over the course of a week (with the beach across the road being a distraction).  But, hopefully I can expand later as this term proceeds, and look forward to hearing your thoughts in the comments.

Posted in • ReflectionSoftwareGeoGebraTechnologyDigital Education RevolutionLaptops 4 LearningTools | Short URL:


Luke on  24 July 09  at  01:23 AM #
I'm in a Victorian school and have been lucky to have an IWB in my classroom - I agree at the very minimum a data projector is now an essential teaching tool. Geogebra is very versatile for demonstrations. For our school I was recently able to get the technician to include Goeogebra on the school computer image, but that means going to the computer room. Next step is to bring the technology to the classroom with netbooks. For smaller classrooms institutions are turning to plasmsa TVs as an alternative to data projectors.

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Simon Job — eleventh year of teaching maths in a public high school in Western Sydney, Australia.
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