Education plays a crucial role in nation-building by significantly contributing to
intellectual development, societal well-being, and the formation of national identity.
Although SMA Negeri 1 Ngabang is known as a quality school, most students in grade
XI MIPA face challenges in achieving adequate academic performance, especially in
trigonometry. This research aims to determine the influence of students' learning
interest on their performance in trigonometry at SMA Negeri 1 Ngabang. The research
population includes all grade XI MIPA students at SMA Negeri 1 Ngabang, totaling
180 students, with samples consisting of classes MIPA B and MIPA D, totaling 72
students. This study is quantitative, using simple linear regression analysis as
hypothesis testing. The results indicate that students' learning interest has a significant
impact on their performance in trigonometry, with an influence level of 90.8%, while
the remaining is influenced by other factors. Analysis of learning interest indicators
shows that happiness contributes the most (48.4%), while attention contributes the least
(34.6%). The conclusion of this research emphasizes the importance of enhancing
students' learning interest to improve their academic performance.