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Living in a world that is becoming more and more technological, it is natural and essential that technologies must be used by students and teachers as a tool to support teaching and learning in classroom environments. 

Concerning mathematics and looking at free-softwares, GeoGebra is a very good choice. 

Exploring the potential advantages of integrating dynamic environments, we present the methodology and the strategy behind the conception of interactive activities, regarding the study of Trigonometry, through a geometric and historical approach, bringing to light the way trigonometry was applied in ancient times.

 

 

1. Ptolemy
2. Almagest
3. Chord Table
4. Sine
5. Euclid´s Elements
6. GeoGebra
7. sine
8. Regression
9. Ptolemy´s Table of Chords
10. Chords Formulas
11. Chord of 1º
12. Greek Solar Model
13. Equinox
14. Solstice
15. Eccentricity of the Sun