Geogebra

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Geogebra is a "dynamic math software" program to aid in the understanding of geometry, algebra, and calculus.

Geogebra can be downloaded and installed, or just run as a web-based application. Click here to access both options.

The best way to get started with Geogebra is to use already done applets that others have created and shared on the Geogebra wiki.

Here are some good examples for:

Geometry

 * Missing lengths in similar triangles - students can work out problems themselves, then "drag away" boxes to reveal the correct answers with the proportions.
 * Exploring the relationship between the central angle and the inscribed angle to its intercepted arc.

Algebra

 * Plotting Points - an interactive line graph activity. Be sure to click on the plus sign to show the directions for the activity.
 * A very nice applet on watching the graph of a parabola with the function in the form y=c(x-a)(x-b), with sliders to change the values of a, b, and c. Nice questions at the end also.

Calculus

 * Look at the graphs of the first and second derivatives of a function. Use the slider to change the point of tangency.
 * Visualize Riemann sums - left endpoint, right endpoint, midpoint, and compare these with the actual integral value.

Elementary

 * Visualizing fractions on a number line
 *  Having students find the fraction on a number line

<span style="font-family: 'Palatino Linotype','Book Antiqua',Palatino,serif; font-size: 130%;">Can't find the perfect applet for you? Then make your own! <span style="font-family: 'Palatino Linotype','Book Antiqua',Palatino,serif; font-size: 130%;">There are really interesting tutorials on this blog. <span style="font-family: 'Palatino Linotype','Book Antiqua',Palatino,serif; font-size: 130%;">Once you get your feet wet, and you're ready to start writing your own, you can learn everything here in the Geogebra manual. <span style="font-family: Georgia,serif; font-size: 120%;">More resources: <span style="font-family: Georgia,serif; font-size: 120%;">Introductory Materials, a user forum to ask questions or search commonly discussed topics, and a few other odds and ends.

<span style="font-family: Georgia,serif; font-size: 120%;">GeoGebra Webinar
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<span style="font-family: Georgia,serif; font-size: 120%;">GeoGebra File Share
Click here to visit the page where we can share applets we have written.