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Students' poor performance in Geometry is due to their problem in visualizing. Therefore, teaching strategy for Geometry should be embedded with visualization techniques. Visual learning Geometry Kits also known as VLGeo-Kits, is a teaching approach that consists of 3-Dimension blocks, screencast video and SketchUp Make. The purpose of this study is to investigate the effects of VLGeo-Kits in developing students' performance in Geometry for topic Plans and Elevations. This study was conducted using a quasi-experimental single group pre-post-test which was employed for five weeks. A total of 54 form three students were involved in this study. Van Hiele Geometrical Thinking (vHGT) test was given to the samples before and after their learning using VLGeo-Kits. The findings showed very positive development in geometry thinking after learning using VLGeo-Kits. It was found that, none of the samples was at visualization level and majority of the students (59.3%) were at informal deductive level. The finding indicated that the students' level of vHGT after learning using VLGeo-Kits was higher as compared to without using VLGeo-Kits. In addition, Z obtained with p-value was -5.982 proving there was a significant difference in students' level of vHGT test before and after learning using VLGeo-Kits. In conclusion, the findings showed that VLGeo-Kits had succeeded in enhancing students' level of geometrical thinking. Hence, this teaching approach should be implemented in the curricular of mathematics for secondary school.

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