Create one rectangular 3D solid in AutoCAD Desktop using BOX: 100 × 30 × 5 mm. Check its properties with LIST, including the expected volume of 15,000 mm³, then save, close and reopen the drawing to inspect the result. Recorded in AutoCAD R26.0.118.0.0; your interface may differ. Beginner lesson with English narration. Practise in a separate training file, not a live project.