\input zb-basic
\input zb-matheduc
\iteman{ZMATH 1989f.00432}
\itemau{Trejo, C.A.}
\itemti{Structuring geometry using transformations. Estructuracion de la geometria mediante transformaciones. Zur Strukturierung der Geometrie ueber Abbildungen.}
\itemso{Element. Mat. (Apr 1987) v. 1(3) p. 5-12. [ISSN 0326-8888]}
\itemab

\itemrv{~}
\itemcc{G50 G40}
\itemut{Transformation Geometry; Congruent Transformations; Line Reflections; Teaching Methods; Elementary Geometry; Group Theory; Educational Analysis; ; Abbildungsgeometrie; Kongruenzabbildung; Achsenspiegelung; Methode; Elementare Geometrie; Gruppentheorie; Didaktische Analyse}
\itemli{}
\end