PENGARUH PENERAPAN MODEL PROBLEM BASED LEARNING TERHADAP HASIL BELAJAR SISWA MATERI BANGUN RUANG SISI LENGKUNG KELAS IX SMPN 3 TONDANO. jsoscied [Internet]. 2025 Jun. 15 [cited 2026 Apr. 19];8(1):86-93. Available from: https://jurnal.poltekstpaul.ac.id/index.php/jsoscied/article/view/915