🔍 Key Concepts

• orthographic projection views (side and front) in a simple mechanical drawing • standard line types in drafting: visible line, hidden line, and centerline • how a hole through a block is represented in different views

💭 Think About

• Compare the dashed pattern of the line marked B with the pattern of the line marked D. Which one matches the usual drafting symbol for a centerline? • Look at how the two views (left rectangular block and right square face with a circle) are aligned. What is line C doing between those two views? • Ask yourself: does a simple straight line by itself usually indicate a diameter, or is the diameter normally shown in a different way on a drawing?

✅ Before You Answer

• Identify which line type (solid, evenly dashed, long‑short dashed) is used for hidden lines and which is used for centerlines in standard drafting practice. • Check whether line C passes through the centers of the shapes in both views or instead outlines something that is not directly visible. • Verify that a mechanical connection would normally require additional detail (fasteners, fittings, or symbols), not just a single thin line.