Oscar Orlando Ortiz Corredor, Lady Alexandra Gelvez Ortega. GEOMETRIC CONCEPTS OF LOCAL CHANGES AND CUMULATIVE EFFECTS IN BASIC SECONDARY EDUCATION FOR GRADES 8° AND 9°. DIALÉCTICA [Internet]. 2026 Oct. 2 [cited 2026 Oct. 3];2(31). Available from: https://revistas.upel.edu.ve/index.php/dialectica/article/view/6387