Özet:

In this study, blind students’ concept images and concept definitions regarding the triangle were investigated. For this purpose, 6 open-ended questions were asked to five blind students. The participants were asked to use the magnetic materials for constructing the triangle and one interview question was presented through a raised-line material. In this qualitative research, data obtained from the interviews, observation notes, the pictures of raised-line materials and geometric figures with magnetic materials constructed by participants, were analyzed through the grounded theory techniques and the constant comparative analysis method. As a result, blind students mostly used the concept images and rarely used incomplete concept definition. Besides, participants had difficulties regarding the triangle such as position and the angles of the triangle, naming, classification. Lastly, the relation between the concept image and the concept definition cells, which the participants utilized for the triangle was emerged in two ways namely heuristic and formal-heuristic

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