Are your pupils exploring geometry? Do you have an interactive whiteboard or wireless slate? If so, you’ll want to take a look at two very useful **FREE **programs that I’ve been sharing that make learning mathematics an engaging experience. Over the weekend, I was fortunate enough to be invited to attend and present at the 2009 Math & Science Summit Conference in **Liberty County**, Georgia. While I was there, I shared interactive math resources with the system’s high school teachers.

During the course of my presentation, I introduced the teachers in attendance to one of my favorite freebies, a program called **GeoGebra**. This spiffy tool for thinking helps students create constructions with all the necessary components: points, segments, lines, vectors, and functions. thanks to its dynamic interface, **GeoGebra** allows users to directly enter and manipulate equations and coordinates. You can download the program or use its **Webstart feature**. My audience at the Math & Science Summit Conference also appreciated the **GeoGebraWiki**. It’s a growing repository of all kinds of free teaching materials using **GeoGebra**.

**C.a.R.** is another free resource that I shared with my attendees. This application is useful for generating dynamic geometric compass and ruler constructions on a computer. Thanks to the digital nature of the displays created with **C.a.R.**, constructions can easily be altered by simply dragging one of the basic construction points. Like GeoGebra, there is a **Java Webstart edition of C.a.R.** that is always up to date with the most recent program version. Imagine students discussing and demonstrating their constructions using an interactive whiteboard.

**Related resources**:

**GraphCalc** is an open source and GPLed computer program that runs in Microsoft Windows and Linux that provides the functionality of a graphing calculator. I like this program.
**MatheGrafix** is a program for drawing, presentation and printing graphs of functions.