GeoGebra 4.0 offline installer, now available

If your PC/Mac is not always connected to the internet, or you have a computer laboratory with no internet connection, you can now download the GeoGebra 4.0 offline installer.

GeoGebra 5.0 Beta is also in development. 

Area of a Trapezoid

Move point A to change the shape of the trapezoid.  Then move slider  to the extreme right to rotate the trapezoid.

This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com

1.) What kind of quadrilateral  is formed when  equals 180 degrees? Justify your answer.
2.) What is the relationship between the area of trapezoid ABCD and the area of the quadrilateral formed in 1?
3.) Using the quadrilateral formed in 1, find the area of the trapezoid. Hint: Use  and .


Download GGB File

Testing Post - Social Network Integration

Recently, GeoGebra Central's automatic feed to Facebook and Twitter stopped. I am currently troubleshooting so please ignore this post. 

GeoGebra 4.0 now available

This is a repost from Math and Multimedia, my main blog. 

The long awaited  GeoGebra 4.0 is now available online. The Webstart files and Applet Start can be are fully functional.  Hopefully the offline installers will be available soon.

Some of the new features according to the website (haven’t explored all of them yet) are the following:

• GeoGebraTube: easily share worksheets online (see “File” menu)
• User interface: drag & drop, style bar, perspectives, accessibility
• New tools: data analysis, chart dialog, probability calculator, function inspector
• Copy & Paste, two Graphics views
• Inequalities and implicit equations
• Improved text tool, better equation displaying
• Filling options with hatching and images
• Animation of points on lines, dynamic limits for sliders & axes
• Buttons, input boxes, scripting
• Export to animated GIF
• 50 languages

To know more about the other features, go to the GeoGebra 4.0 Release Notes and the updated GeoGebra Manual. The GeoGebra Prim, the version for younger students is also now available.

I will be revising my GeoGebra tutorials soon to make them compatible with the new version.