Powerful imagery using Geogebra

I absolutely love Geogebra, I use it in nearly every lesson to the extent that I’m not sure how I would teach certain topics without it!

I’ve written before about the power of starting from a blank sheet (angles in parallel lines, trigonometry, circle theorems), but recently I have found and used some excellent visualisations that other users have created and kindly uploaded. I feel like this aspect of Geogebra has improved considerably over the last couple of years in particular the search. I often have an idea in my head for what I want to show students and within a few seconds I have found exactly what I need by searching.  Using dynamic geometry that you can narrate to (or not) is so much better than just playing a YouTube video.  I try to think of points where I can ask “what will happen if…” type questions.

Here are my latest finds that I have used in class recently. Click on them to take you directly to the Geogebra. I’m sure this collection will be added to as I find more.


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Basic Angle properties

I created these questions for my Year 7 class after a fairly disastrous lesson when I made a leap that was far too big for that class.  We had already had a couple of lessons where we had looked at angles as a measure of turn, using a protractor and the basic angle facts, using some of the resources from @mathsjem‘s great blog post here.  Although they could do the basic angle facts separately, I wanted to mix them up just enough that they could appreciate the differences between them and then gradually move onto multi-step problems.  I couldn’t find any questions that were right, so I ended up creating 3 pages of questions with gradual variation at each stage.  I gave them these one sheet at a time and we had a lot more success. Phew!

I’m sharing these as a Word document so you can chop and change what you need for your classes.

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