prototype, geometry, planimetrics

The paper is focused on the detection of a tendency of primary and secondary schools´ students to have a prototypical thought in planimetrics and consequences for mathematical thinking in geometric subjects of university students. The summary of the results which have been reached by questionnaires given to the selected schools are described (if the way used by students to sketch the specified units is similar to what they may have seen in the textbooks, eventually to results of their teachers, or if it depends on, for example, left-right orientation, sex, age or type of studied school). In addition, activities that are being prepared in this context for the students of our university study programme will be described.