Astariah, R.; Ratnaningsih, A. Improving Learning Outcomes in Solid Geometry through Project-Based Learning (PjBL) Using Concrete Media in Grade 3 at SDN 6 Kaur. <meta name="google-site-verification" content="hk1EvV2s9SCchFUV_4f7GgLdW5pQDckkxwSCWkj4stU" /> 2026, 4, 569-578.