Razão áurea e a etnomatemática das tesouras de teto de uma escola pública de São Gonçalo do Piauí

Abstract

The present work aimed to understand the relationship between the golden ratio and the ethnomathematics applied in the construction of the scissors on the ceiling of the Francisco Nunes school unit. Since the ceiling trusses are support and resistance structures, these characteristics are the main attributes of the golden ratio, and as these two aspects have been practices used for years, ethnomathematics is a reference that provides the basis for this study. Through qualitative research, the ethnomathematics knowledge and practices present in the construction of ceiling scissors are sought, enabling a study that values academic and non-academic knowledge. With this, the research used photographic records, interviews and measurement of scissors using the following materials: measuring tape, smartphone, paper and pens. The results obtained by the research show the carpenters' jargon and stages of construction of the ceiling shears. Furthermore, it is argued that although the scissors are proportionate in their construction measures, the golden ratio is not present. Thus, this work brought together ethical and emic knowledge that enable the creation of mathematics teaching strategies for basic education in a contextualized way with facts from the realities of the school itself and local culture