<![CDATA[This study aims to determine the effect of project-based learning on students' conceptual understanding abilities in the topic of cylindrical three-dimensional shapes in junior high school. The type of research used is quasi-experimental with a pretest-posttest control group design. The research subjects consisted of 64 students, divided into an experimental class and a control class, each comprising 32 students. The research instrument was a conceptual understanding ability test consisting of essay questions. The data were analysed using the Shapiro-Wilk normality test, Levene's Test for homogeneity, and the independent two-sample t-test. The results showed that the posttest data of both classes were normally distributed and had homogeneous variances. The t-test indicated a significant difference between the conceptual understanding abilities of students in the experimental and control classes (Sig. = 0.006 < 0.05), with the experimental class posttest mean being higher. This indicates that project-based learning is effective in enhancing students' conceptual understanding skills. Project-based learning provides contextual learning experiences, encourages active student engagement, and strengthens meaningful understanding of mathematical concepts.]]>
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