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The alternating education system are effective on many departments and so on mathematic. First step is that the courses are not teacher centered but learner centered. The system are changed by passing from the behaviourist education system to the constructivist education which focus on the learner and learning with real life. So, a new material about geometrical objects is developed for 8th grade students at primary school. The material is a puppet every part of body made from a geometrical object. The purpose of this research is to observe the effects of the geometry teaching by using this puppet. In our research, the method is applied on the 8th grade students. The sample of research included 50 student from 8th grade of a primary school of Sivas Ministry of Education in 2013-2014 education year. The Controlled Group Pre-test and Final-Test model is used in research. This model includes two groups developed by neutral posting. One of these groups is called test group and the other is control group. The pre-test and after test measurements are applied on the groups. The Achievement Test of geometrical objects is used to collect data. At the end of the research it is observed that the test group that the puppet model is used, is more successful than the group that traditional education model is used. Report shows that the learner-centered model rises the academic achievement in schools

The Effects of Teaching Geometry on the Academic Achievement by Using Puppet Method