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geometryOnline and interactive
Changing the way geometry is taught
Changing the way geometry is learnt

Try one of these three online courses, each of which is a comprehensive study of one aspect of geometry. Everything uses interactive resources that should run automatically.
The courses are powered by Cinderella. Buy the software at shareit.com
construction Interactive Construction an online course... points, lines, circles, perpendiculars, bisectors, Euclid, irrationals...
transformations Interactive Transformations an online course... reflections, rotations, translations, enlargements...
shape Interactive Shape an online course... polygons, circles, classifying, locus, congruence...
Or you could try one of these topics...
Transformations : a collection of resources
Euclid's elements: the 48 propositions from Book 1
sacred geometry: philosophy and practice
The hidden world of triangles and circles
Circle only constructions: no rulers allowed
An exploration into two circles: geometry & imaginary numbers
Pythagoras' theorem: proofs and problems
Is this a square?: how to decide
The egg project: how to construct Euclidian eggs
Circle theorems: six properties
Geometry in 3 dimensions: solid shapes
The incircle: unexpected properties
Feynman's lost lecture: motion of planets around the sun

Recommended books An interactive glossary forumDiscussion forum Take this Geometry tour Policy statement

Interactive geometry powered by Cinderella and JavaSketchpad and CabriJava and C.a.R.