This post was inspired by Simon Job. He has used Geogebra to produce co-ordinates of the outline of a picture. These co-ordinates are then transferred to Excel and then pasted into Word to produce a “Join the Dots” activity to give students practice at locating points on a cartesian plane. His Brisbane Broncos Number Place Logo was posted on 20 Sep, 2009.

I particularly liked Simon’s idea, so I set out making one of my own. Unfortunately I soon became frustrated because I couldn’t work out how to paste a picture into Geogebra. Is this only available in the Apple version? So I started to think about what software I had previously used that could work. My memory still works sometimes and I recalled DigitiseImage.

So I looked at all the AFL clubs and then imported the Western Bulldogs logo into DigitiseImage. I then set the scale and clicked on points all around the logo.

I then clicked the open in Excel button. Having the co-ordinates in Excel is a great advantage. You can easily transform the drawing. For example: moving between quadrants (=A1-10) and changing the scale of the drawing (=A1*4). I also checked what the final diagram would look like with the following: Insert Chart, XY Scatter.

This is what my bulldog now looked like:

Notice that the Excel scattergraph will not join points back up to the starting point! No worries, now paste into a Word document.

You can download my finished worksheet from scribd: Western Bulldogs Co-ordinates.

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## About webmaths

I have been teaching Mathematics in Victorian secondary schools for 30 years. I use the www to make my maths lessons better. I hope this blog will give other teachers some ideas to try in their own classes.

Nice Jeff.

In GeoGebra, the second last icon on the right is the slider. Drop down from that is “Insert Image” – in Windows and Mac versions.

Also, I used GeoGebra because it’s the application installed on the Netbooks being rolled out in NSW (http://www.schools.nsw.edu.au/gotoschool/highschool/dernsw/thelaptop.php#software).

Thanks Simon, I hadn’t noticed the little drop down arrows before!

I actually blog as well and I am writing a thing very close to this excellent blog post, “Western Bulldogs Number

Place Logo Webmaths”. Would you mind if perhaps Iemploy a lot of of your personal suggestions?

Thank you ,Hershel