• interactive geometry applets
• plane geometry step bY steP
• descriptive geometry step by step
• curves
• theorems

in the applets of the following geogebra books that are dynamic and interactive, one may manipulate certain elements of the construction and analyse the different results obtainable; in other books, the constructions and exercises are solved step-by-step, allowing the user to move backwards or forward in its resolution.

although the text in most of the applets is in portuguese, the constructions are, nonetheless, understandable.