http://www.aloha.net/~bigwind/20kidskites.html  20 Kids * 20 Kites * 20 Minutes.  This site has detailed instruction on making kits.  Teacher can use this information to teach students about geometry.

http://www.apples4theteacher.com/math.html#geometrygames Apples4theTeacher Geometry Games - Geometric Shape Games

www.catchupmath.com Catchup Math  This site is targets towards at risk student's math performance.  The online programs has a cycle of quizzes, reviews and practice questions that are geared for per-Algebra, Algebra1 & 2 and geometry.  This site has quizzes, videos, activities and games to help students 'catchup'.  This site can also be used with a SmartBoard.

www.mathforum.org/trscavo/geoboards/intro2.html Geoboards (8-12) This site has information for teacher introducing and explaining Geoboards

www.ics.uci.edu/~eppstein/geom.html Geometry in Action. (11-12) INTERACTIVE This site is a portal type of site that has a collection of links to sites that provide information on how ideas from discrete and computational geometry are involved in real-world applications.

http://agutie.homestead.com Geometry from the Land of Incas. (9-12) INTERACTIVE  This site provides an eclectic mix of sound, science, and Incan history intended to interest students in Euclidean geometry. The site includes geometry problems, proofs, quizzes, puzzles, quotations, scientific speculation, and more. Created by Antonio Gutierrez  New materials & links include:
            http://agutie.homestead.com/files/nagel_point1.htm  Nagel Point Theorem Proof 
            http://agutie.homestead.com/files/nagel_point_flow.htm Nagel Point Theorem - Flowchart Proof 
            http://agutie.homestead.com/files/Puzzle_NagelPoint.htm  Puzzle of Nagel Point:  22 pieces of poloygons 
            http://agutie.homestead.com/files/semiperimeterexcircles1.htm Semiperimeter & excircles of a triangle
            http://agutie.homestead.com/files/semiperimeterincircle1.htm Semiperimeter and incircle of a triangle 
            http://agutie.homestead.com/files/semiperimeterexcirclesinc1.htm Semiperimeter, incircle & excircles of a triangle

http://mathforum.com/geometry/k12.geometry.html Geometry from Math Forum.  This site give teachers many ideas and activities fore teachgin Geometry for all grade levels.

www.geometry.netGeometryNet. (9-12) INTERACTIVE  A site dedicated to geometry.  Links include activities, games and worksheets to help teach geometry.  A great resource site for geometry teachers.

 

http://math.rice.edu/~lanius/Geom Geometry Online. (6-12)  This site contains geometry interactive activities for students and new activities are added monthly.

 

http://intermath.coe.uga.edu/construc/homepg.asp InterMath Constructionary (6-12) This activity is meant to help learners create constructions using Geometer’s Sketchpad. Click on a letter of the alphabet to obtain a list of constructions for that letter (P: Parallelogram, Pyramid, Prism) and then click the numbers to 'construct' the shape. Explanations are minimal so teacher involvement might be necessary.

http://earthmeasure.com/ Native American Geometry (6-12) INTERACTIVE.  This site explores the physical, proportional Native American geometry that originates from the simple circle and has been practiced for at least 2,000 years.

http://agutie.homestead.com/files/pentagram_menelaus1.htm Pentagons & Pentagrams (6-12) INTERACTIVE   This site has interactive dynamic geometry software.  This site provides an environment in which students can explore geometric relationships and make and text conjectures.  Also visit http://agutie.homestead.com/files/index.html 

www.learner.org/teacherslab/math/geometry/shape Shape and Space in Geometry (6-12) INTERACTIVE  Geometry and spatial sense are vast; developing deep understanding takes years and encompasses many subfields. The mathematics here spans a range as well, but by no means "covers" geometry in grades K–8.  Symmetry, coordinates, and proportion are the core ideas of the following three activities, which approach shape and properties of shape from different directions.

www.shodor.org/interactivate/activities/tools.html Schodor Math Tools (6-12) INTERACTIVE.  These tools listed below are designed such that they can be used as stand-alone applications in analyzing or organizing numbers and data. They are a subset of the activities . All Interactivity activities are Java applets and as such require a java-capable browser. Included are links to Geometry, Algebra, Probability, Statistics and more.

www.iit.edu/~smile/mathinde.html Smile Program Mathematics Index: Probability. (2-8)  This site provides a list of lesson that can be used in elementary and middle school grades to teach geometry.

www.sosmath.com SOSMath. (8-12) INTERACTIVE This is your free resource for math review material from Algebra to Differential Equations! The perfect study site for high school, college students and adult learners. Get help to do your homework, refresh your memory, prepare for a test,  Browse our more than 2,500 Math pages filled with short and easy-to-understand explanations - from simplifying fractionsto the cubic formula, from the quadratic equation to Fourier series, from the sine function to systems of differential equations

http://mathforum.org/trscavo/tangrams.html Tangrams from Tom Scavo (8-12)

 

http://agutie.homestead.com/files/index.html Triangles & Lissajous Art form Geometry from the Land of the Incas (8-12)