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This study aimed to evaluate the Van Hiele levels of geometric conceptual understanding of the third year high school students in selected secondary public high schools in Lanao del Sur. There were 409 respondents in this study. Two instruments such as geometry test and an interview containing three activities were used to gather the data. The results revealed that there were 312 respondents belonged to level 0 (pre-cognition), 93 of the respondents reached level 1 (visualization), and 4 of the respondents met level 2 (analysis). Not one of the respondents reached level 3 (informal deduction) which is the expected level of geometric understanding of a student before entering third year high school. These results proved true the findings of many researchers (Dindyal, 2007; Genz, 2009; Tan and Yebron, 2009; Usiskin, 1982) that many third year high school students have levels of geometric thought lower than level 3 (informal deduction).

journal of social sciences

Assessment of the Third Year High School Students' Van Hiele Levels of Geometric Conceptual Understanding in Selected Secondary Public Schools in Lanao del Sur