Euclid's geometric algebra
El álgebra geométrica de Euclides. An experience in the teaching of the algebra
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A study based on Eculid´s geometric algebra is presented and a didactical sequence is presented where students identify simple algebraic expressions, such as the distributive law, the square of a binomial and solution of the quadratic equation. Our theoretical framework is base on Jankvist´s proposal where history of mathematics is used as in a historical-genetic purpose. The experimental phase was conducted with students of the first year of a ublic school of the preparatory level, located in the State of Morelos in México. The stages of the study include: a) application of an initial questionnaire, b) didactical sequence supported with ad hoc clinical interview and, c) final questionaire. Our results show that students are able to identify the distributive law as a conservation of area. Clinical interview shows tha in some cases students identify the biinomial formula as the sum of areas of rectangles composing a square, although they do not express completely their thinking in algebraic terms.
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