Best Site to Start Looking for Materials for both Windows and Mac
       http://mathforum.org/geometry/k12.geometry.html  
    Other Resource Sites
           NonEuclidean Geometry (Math Forum - Elliptic, Hyperbolic, Projective)
          An Introduction to Projective Geometry (for computer vision)

 Freeware and Shareware online
    Peanut Software Home Page (freeware) - http://math.exeter.edu/rparris/
    NonEuclid (freeware) - http://cs.unm.edu/~joel/NonEuclid/

Geometer’s Sketchpad Activities and Sites
    Links for Geometer’s Sketchpad and the WWW - http://www.acts.tinet.ie/gsp/
    Introductory Activities - http://mathforum.org/sketchpad/intro/gsp.introlab.html
    Make a Fractal Tree - http://mathforum.org/sketchpad/gsp.activities/fractal2.html
    Spirograph construction - http://mathforum.org/sketchpad/intro/cusplab.toc.html
    Maximize Volume and Area - http://mathforum.org/sketchpad/maxvol/index.html

Java Sketchs (Viewed on Web – Do not need  Geometer’s Sketchpad)
    Java Sketchpad Homepage -http://www.keypress.com/sketchpad/java_gsp/index.html
    Java Sketchpad Gallery - http://www.keypress.com/sketchpad/java_gsp/gallery.html
    Jave Sketchpad Links - http://www.keypress.com/sketchpad/java_gsp/links.html

Geometry
    Centroid of Triangle – http://www.keypress.com/sketchpad/java_gsp/dr1_sketches/jsp_demo_centroid.htm
    Hypercube construction - http://www.keypress.com/sketchpad/java_gsp/hypercube.html
    Peaucellier's Linkage –        
                    http://www.keypress.com/sketchpad/java_gsp/dr1_sketches/jsp_demo_peaucellier.htm
    9-point circle – http://www.keypress.com/sketchpad/java_gsp/dr1_sketches/jsp_demo_9pts.htm

Topology, Knots, Surfaces, Symmetry
       http://www.geom.umn.edu/docs/education/institute91/

 Peaucellier's Linkage (Line into a circle)
       http://www.geom.umn.edu/education/math5337/linkage/

Algebra and Trigonometry
   The Conic Sections - http://www.keypress.com/sketchpad/java_gsp/conics.html
    Sine Curve Construction - http://www.keypress.com/sketchpad/java_gsp/sinewaver.html
    Witch of  Agnesi - http://www.keypress.com/sketchpad/java_gsp/witch.html

 Require Java or VRML Viewer
   Interactive Models of Platonic and Archimedean Solids -
                    http://www.scienceu.com/geometry/facts/solids/handson.html

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