Math Open Reference
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Math Open Reference


Math Open Reference

Logo for Math Open Reference
A free online interactive geometry textbook.  The site has two primary audiences:  teachers using the animations in class with a projector to demonstrate geometry concepts, and students who need a reference source when the teacher is not around.  The scope of the site is all geometry concepts up to and including high school and college general ed.  Each topic has a java applet that both animates the concepts and allows the user to interact with it to gain a deeper... More
Material Type: Reference Material
Technical Format: Other
Date Added to MERLOT: February 04, 2007
Date Modified in MERLOT: August 22, 2012
Submitter: John Page


  • Reviewed by members of Editorial board for inclusion in MERLOT.
    Editor Review
    Very good quality; in queue to be peer reviewed
    avg: 5 rating
  • User review 5 average rating
  • User Rating: 5 user rating
  • Discussion (1 Comment)
  • Learning Exercises (none)
  • Personal Collections (3)
  • Accessibility Info (none)


Primary Audience: Grade School, Middle School, High School, College General Ed, College Lower Division
Mobile Compatibility: Not specified at this time
Technical Requirements: HTML web site with embedded Java applets. Any PC, Mac, Linux with Java installed. Copyright, but you can link to it freely and printed output is not copyright.
Language: English
Cost Involved: no
Source Code Available: no
Accessiblity Information Available: unsure
Creative Commons: unsure


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Discussion for Math Open Reference

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Avatar for Andrea Watley
4 years ago

Andrea Watley (Student)

This site is awesome! I spent about 40 minutes on here. It has just about any and everything you'd like to know about geometry. Each category, (some with sub categories,) have excellent definitions that are straight forward and easy to understand. It also has interactive pictures for there examples that you can manipulate; great for visual learners like myself. In addition, there are formula's, and calculations to show how to solve a certain problem, as well as history facts of famous geometers; (if one should be interested.) This site also provides a great index so you can quickly find your specific subject matter. I would highly recommend this site for any students learning, and/or interested in geometry. I only wish I knew about this site previously when I attended high school, it would have been a great help.

Technical Remarks:

Software very easy to use. One click of the mouse to whatever subject that your interested in, and moving the cursor to manipulate the pictures that are up for example.
Time spent reviewing site: 40 minutes
Used in course