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Technical Drawing

Geometric Construction

Key Points

  • Bisecting a line: draw arcs from both ends, join intersections
  • First angle projection: plan below front view (European standard)
  • Third angle projection: plan above front view (American standard)
  • Isometric drawing: all lines at 30° to horizontal, true lengths
  • H pencils: hard (construction lines); B pencils: soft (outlines)

Practice Questions

2 questions
1

In first angle (European) orthographic projection, the plan view is placed:

2

Which drawing instrument is used to draw circles and arcs?