Assembly Drawings umn.edu âEngineering Drawing and Sketchingâ Cross-Sectional Views Engineering Drawing Sectioning engineering graphics drawing Drawing Tools Reference Dimensions Sections of Objects with Holes, Ribs, etc More Dimensioning Engineering Drawing and Sketching Orthographic or Multiview Drawings Isometric Drawing Dimension Center Lines umn.edu Where to Put Dimensions Half-Sections Dimensioning http://illuminations.nctm.org/ActivityDetail.aspx?id=125 me.umn.edu