THE STUDY OF GEOMETRIC REASONING ABILITIES OF MATHAYOMSUKSA TWO STUDENTS ON PARALLEL LINES BY USING ACTIVITIES THAT PROMOTE GEOMETRIC THINKING การศึกษาความสามารถในการให้เหตุผลทางเรขาคณิต เรื่อง เส้นขนาน ของนักเรียนชั้นมัธยมศึกษาปีที่ 2 โดยใช้กิจกรรมการเรียนรู้ที่ส่งเสริมการคิดทางเรขาคณิต
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Abstract
The purpose of this research was to study the geometric reasoning abilities on parallel lines by using activities that promote geometric thinking. The participants were 38 Mathayomsuksa two students of a large school in Bangkok. The research instruments used in the study consisted of 13 lesson plans using activities that promote geometric thinking and the geometric reasoning abilities test based on geometric thinking level of Van Hiele (1957). Data from the test were analyzed by using descriptive statistic and content analysis to conclude students’ geometric reasoning abilities during and after learning through the activities. The results of the study revealed that the students developed their geometric reasoning abilities during learning in all three levels, that are Analysis level, Informal deduction level and Formal deduction level. The students’ geometric reasoning abilities developed better when they gain more experience in writing the reasons. In addition, students’ score of geometric reasoning abilities in the test after learning were higher than 60 percent of total score. Most of them had well geometric reasoning abilities in Analysis level and Formal deduction level. However, they still need to practice at Informal deduction level due to they cannot give correct and complete reason for selected properties and theorems.
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