Analisis Proses Abstraksi Matematika dalam Memahami Konsep dan Prinsip Geometri Ditinjau dari Teori Van Hiele

This study aims (1) to analyze the process of abstraction of class XI IPA 2 of Lubuklinggau State 6 High School in understanding the concept of geometry overviewed from Van Hiele theory; (2) to analyze the process of abstraction of students of class XI IPA 2 in Lubuklinggau State Senior High School 6 in understanding the principles of geometry overviewed from Van Hiele theory. The method used in the study was a qualitative method. The results of data analysis obtained from five thinking stages based on Van Hiele's theory that theoretical of grade XI science 2 students of State Senior High School 6 Lubuklinggau only at stage 0 to stage 2, meanwhile at stage 3 and stage 4 the level of thinking of students of class XI 2 Science 2 State Senior High School 6 Lubuklinggau was still having difficulties in drawing conclusions from general matters towards specific matters and at this stage it is also a stage of thinking that is high, complicated and complex. Therefore, it can be concluded that the level of thinking of XI IPA 2 students at State Senior High School 6 Lubuklinggau is still low. Keywords: abstraction process, geometry concept, Van Hiele theory