CALCULATION OF POLYGON AREAS IN A DYNAMIC APPROACH USING GEOGEBRA SOFTWARE IN THE 9TH YEAR OF ELEMENTARY SCHOOL
Flat Geometry; Van Hiele theory; Polygons; Areas; GeoGebra.
In this dissertation we will present a didactic sequence for teaching polygon areas using the GeoGebra software. For this purpose, a bibliographical study was carried out. Some concepts of plane geometry were covered, especially such as polygon area formulas, making use of the area formula demonstrated in the Dissertation made by (Lima, 2014) [17], where demonstrating a formula through Determinants, using the coordinates of the points in a Cartesian graph, whose area is the sum of the halves of these determinants. Projections of area formulas using this method were shown. Polygon constructions were made in the GeoGebra Software, calculating the areas to check whether the results generated by the formula were correct. Finally, a didactic sequence was made to apply the concepts mentioned.