GeoGebra Extra: What is GeoGebraTube?

In GeoGebra Sneak Peek 10, the last installment of my GeoGebra 4.0 Sneak Peek Series, I have mentioned about GeoGebraTube, the latest website of GeoGebra used for storing GeoGebra applets. I have used the site for almost a week and its running perfectly.  Although there are times that some applets do not show up, but  I think this has nothing to do with the  website. It’s probably because the GeoGebra 4.0 Release candidate is still being refined.

I have already created by my own “channel” and have uploaded several of my applets. All applets uploaded in GeoGebraTube include GGB files that you can download, but take note that these files are under Creative Commons, so if you use them, do not forget to link back.

For GeoGebra users, you can upload by going to the GeoGebraTube website or or by clicking File>Export>Dynamic Worksheet as Webpage(html).  In the Dynamic Worksheet Export dialog box, just select the GeoGebraTube option and to open the GeoGebraTube website.

GeoGebra Advanced Tutorial 11 – Embedding GeoGebra Applet in WordPress Blogs using the Media Library

Note: This tutorial is for hosted WordPress blogs.  As of this writing, GeoGebra applets cannot still be embedded in blogs.
1.) Be sure that you have a WordPress iframe plugin. I use Embed Iframe in embedding GeoGebra applets so I recommend that you use it since I don’t know if the code is similar using other plugins.
2.) Export Your GeoGebra Worksheet as Dynamic HTML. Be sure to take note of the width and the height of your applet. These can found in your Advanced tab of the File Export dialog box.
3.) (Optional): Edit your HTML file using a Text Editor (see how below). Although this is optional, I recommend that you do this.
4.) Go the the Library in the Media panel your WordPress Dashboard and upload your dynamic HTML file.
5.) Once the file is uploaded, click on the Library link again in the media panel to display all the uploaded files and click the file name link of your GeoGebra html file. This will display the Edit Media page. » Read more

Paper Folding: Extracting the cube root of a number

In the previous post on paper folding, we have learned how to use paper folding to extract the square root of a number on the number line. In this post, we are going to learn how to extract the cube root a number by paper folding. The steps in constructing the fold is very similar to extracting the square root.

Paper Folding Instructions 

  1. Get a rectangular piece of paper and fold it in the middle, horizontally and vertically, and let the creases (see green segments in the applet) represent the coordinate axes.
  2. Let M denote (0,1) and let R denote (-r,0).
  3. Make a single fold that places M on y = -1 and R on x=r.
  4. The x-intercept of the fold is \sqrt[3]{r}.
The GeoGebra applet below visualizes the fold. Drag points P and Q to satisfy the conditions above. Note that you can also move point R» Read more
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