Geometric interpretation of the signs of trigonometric ratios with Geogebra

Abstract

The teaching of Trigonometry has been characterized by an algebraic approach, which has made its study a memoristic and a mechanical process. A content where the previous can be evidenced is the signs of the trigonometric ratios, which tend to be treated through the use of mnemonic devices, action that limits its comprehension. With the aim of supporting the overcoming of this problem, in this paper it is described the design of an elaborated resource with the software GeoGebra and its application in a sequence to analyze and make sense of the Sine, Cosine and Tangent ratios. The design of the resource was based on the TPACK model (Mishra & Koehler, 2006). It is deemed pertinent that teachers have this style of resources in the sense that these help them in their teaching practices supported on technological environments like GeoGebra.

Keywords

• razões trigonométricas
• regras mnemotécnicas
• GeoGebra