🔍 Key Concepts

• Mechanical drawing line types and what each represents • Difference between a visible/outline, hidden, sectioning, and phantom line • How line D is drawn (solid vs dashed, light vs heavy) compared to other labeled lines

💭 Think About

• Look closely at line D and compare its pattern and thickness with lines A, B, and the dashed lines—what does that suggest about whether the feature is visible, hidden, or just referenced? • Ask yourself: is line D showing an actual edge that you can see in this view, an edge that is behind something, a cut/slice through the object, or an alternate/adjacent position of a part? • Compare line D with the lines used in the section view I–I on the right—does D match those, or does it match another style on the main drawing?

✅ Before You Answer

• Verify whether line D is solid or dashed, and whether it is thick or thin • Check if line D corresponds to a real, visible edge of the part in this view, or if it indicates a hidden or alternative feature • Confirm that line D is not the type of line used to show cross-hatching (sectioning) inside the part in Section I–I