Özet:

The general purpose of this study is to study high school students according to geometric thinking levels and geometry self-sufficiency beliefs according to certain variables. The research was carried out in the screening model. The universe of research is formed by students who study in the districts of Kahramanmaraş onikişubat and Dulkadiroğlu. The study consists of 505 students studying in five different high schools. The data of the study was collected with the "Van Hiele Geometric Thought Level Identification Test" and the "Geometry-Oriented Self-Compliance Faith Scale". Some of the results obtained in the study are: more than half of high school students are below the geometric thinking levels should be, geometric thinking levels of students are not varied according to gender variation and pre-school education conditions, geometric thinking levels of eighth class students are higher than the geometric thinking levels of the seventh class students, and the geometric thinking levels of students are also higher as the mother and father education levels rise. The conclusions have been made that the students’ self-sufficiency beliefs towards geometry are positive, the gender variable does not affect the students’ self-sufficiency beliefs towards geometry, the highest self-sufficiency beliefs towards geometry are found by the students of the seventh grade, the students in pre-school education and the students with a high educational status of parents. It is also concluded that there is a meaningful relationship between geometric thinking levels of students and their beliefs of self-sufficiency towards geometry at a low level of positive direction.