In this study, it was aimed to examine the effect of 5E learning model based on constructivist approach on the development of proof skills in geometry on students. The study was carried out with 34 students in to different classes of the grades of a secondary school in a district of the western Black Sea Region . The experimental and control groups were selected randomly. In the study, semi-experimental model with pre-test and post-test control group was used. In the experimental group the lessons were conducted with the materials developed in accordance with the 5E learning model whereas in the control group lessons were conducted according to the methods and models advised by the textbooks based on mathematics curriculum. Proof skills evaluation test was used on the students both groups as the pre-test before the study. The same test was used again as the post-test at the and of the study. In addiation, a structured questionnaire was applied to the experimental group at the end of the study. As a result of the statistical studies, it is seen that lesson activities about circles prepared according to the 5E learning model have no significant effect on the development of the proof skills of the students in geometry. However, it was observed that the answers or experimental groups students were more qualified.
Constructivist approach,5E learning model, proof skills, circle and circumference