About Us

Contact Us

Welcome to GeoGebra of California!

Get involved today.

The mission of the GeoGebra project is to empower students and teachers at all levels to learn and teach mathematics with our easy-to-use and freely available software and interactive materials.

The international GeoGebra Institute (IGI) is a rapidly growing network of non-profit organizations around the world. Our local GeoGebra Institutes join teachers, students, software developers and researchers from all over the world to engage in the following activities:

  • design of free teaching and professional development materials
  • face-to-face and online workshops for teachers
  • organization of student competitions
  • online support for GeoGebra users
  • software development for GeoGebra
  • translation of GeoGebra documentation
  • research projects concerning GeoGebra and IGI
  • publications in journals
  • presentations at national and international conferences

If you would like to get involved, please write to:

[email protected]


  • GeoGebra - Finding the Circumcenter - Kelly Castaneda

    Teaching Students to Construct a Circumcenter

    In this video, Kelly shows how to use GeoGebra to teach students how to construct a circumcenter, explore its properties, apply it to a common problem of where to sit in the food court, and connect it to future concepts with circles. Teaching Students to Construct a Circumcenter Kelly Castaneda is an instructor and chairperson […]

  • GeoGebra - Dividing a Segment into Three Congruent Segments - Kelly Castaneda

    Challenging Students to Divide a Segment into Three Congruent Segments

    In this video, Kelly shows how to use GeoGebra to challenge students to divide a segment into three congruent segments.  The students solved this problem through the traditional method of constructing parallel lines and a less common method of constructing a centroid. Challenging Students to Divide a Segment into Three Congruent Segments Kelly Castaneda is […]

  • GeoGebra – First Steps to Advanced Customization

    First Steps to Advanced Customizing of GeoGebra walks the user through five areas to modify the graphing area in GeoGebra to suit your graphing style. Bill Lombard shows how easy it is to make GeoGebra look and feel just the way you want it.  Learn how to: Control the x-y Settings, grid and axes and the […]

  • GeoGebra – First Steps to Intermediate Customizing

    First Steps to Intermediate Customizing of GeoGebra is a video tutorial showing 5 items: Point capturing Rounding to 2 decimal places Moving the graphics window Zooming in/out Choosing your language After viewing you will be able to customize GeoGebra to your liking, be able to use GeoGebra more easily, and also be more productive.

  • GeoGebra – First Steps to Basic Customizing

    First Steps to Basic Customizing of GeoGebra demonstrates five items that will make your GeoGebra experience more productive and personal. Learn how to view grid and axes Get to the Home Position easily Set your font size for you and for classroom/large audience viewing Set your text defaults for on-screen writing Set your default drawing options […]

  • GeoGebra – First Steps – Downloading

    This is a tutorial showing the viewer how to navigate to the GeoGebra website and download this free open-source dynamic software package. Users will be introduced to the main GeoGebra site and the several ways to interact with this powerful mathematics software package. Download and enjoy the math playground for the mind!

  • Markus Hohenwarter about GeoGebra

    Markus Hohenwarter speaks about GeoGebra.   What is GeoGebra? The following information can be found on GeoGebra’s main website. GeoGebra is a free and multi-platform dynamic mathematics software for all levels of education that joins geometry, algebra, tables, graphing, statistics and calculus in one easy-to-use package. It has received several educational software awards in Europe […]


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