GeoGebra

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The Web2.0 tool I have chosen is GeoGebra. GeoGebra is a free interactive mathematics tool "for all levels of education that joins geometry, algebra, tables, graphing, statistics, and calculus in one easy-to-use package" ([|www.geogebra.org/cms/en/info]). This tool has won numerous awards worldwide since 2002 for its educational functionality. I encourage you to explore the wiki pages on their website where users have submitted a plethora of materials they have created that you can use for free! You may find something you could utilize in your classroom (e.g. Geography, Art, Music, or games​). Their forum pages are extremely helpful as well.

I just started to use GeoGebra in my Geometry classes last year and will use it in my Trigonometry classes this year. I am beginning to investigate how I might be able to use it in a statistics unit that I teach as well.

In Geometry I use Geogebra to:
 * explore circles including chords, internal angles, tangents, and measurements
 * investigate properties of polygons
 * manipulate shapes to prove postulates

Although I have not used GeoGebra in Trigonometry yet, I have developed a dynamic file that shows how a sine function is affected as you change certain constants within the equation. I have included the file below; please open it and click on any of the dots on the sliders in the upper right hand corner of the applet and slide them right or left. Observe how the graph changes and also notice the change in the standard sine equation under "Dependent Objects" on the left hand side. If you want to get back to the original graph, simply click on the reset button in the upper right hand corner. ​

I hope you enjoy the powerfully dynamic tool of GeoGebra! Scott DeNoyer

Logo from [|www.geogebra.org]