PROSES BERPIKIR SISWA TUNAGRAHITA RINGAN DALAM MEMAHAMI KONSEP SEGITIGA BERDASARKAN TEORI VAN HIELE

Abstract

Abstract. This research describes about thinking process of students with light intellectual
disabilities in understanding concept of triangle. The thinking of students with light intellectual
disabilities based on the Piaget's stage that is disequilibrium, assimilation, accommodation and
equilibrium. The description of the thinking of students with light intellectual disabilities will be
associated with the Van Hiele theory. The instrument used in this research was question tests about
concept of triangle and guidance interview to dig thinking process of students with light intellectual
disabilities in understanding concept of triangle. When students are confuse or imbalance when
given test item is called disequilibrium. Stages assimilation occurs when students acquire new
knowledge, then if the students are already familiar with the new knowledge will be accommodation.
If assimilation and accommodation there will be a balanced is called equilibrium. The results
showed that student can mention the character of triangle so well that the student are at level 1
(analysis) Van Hiele theory. The other student can also mention the character of triangle, but the
character of the vertex of a triangle can not be mentioned so well, therefore that student is at the
level 0 (visualization) Van Hiele theory.
Keywords: Piaget's Stage, Theory Van Hiele, Thinking Process, Students with Light Intellectual
Disabilities