Meanings for angle through geometrical constructions in 3d space

Citation:

Kynigos, C., Psycharis, G., & Latsi, M. (2009). Meanings for angle through geometrical constructions in 3d space. In M. Tzekaki, Kaldrimidou, M., & Sakonidis, C. (Eds.), Proceedings of the 33rd Conference of the International Group for the Psychology of Mathematics Education (PME 33) (Vol. 3, pp. 457-464). Thessaloniki, Greece: PME.
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