Unit 1ProjectionsHARD
Projection of Circle on Inclined Plane
A circle of 60mm diameter lies on a plane inclined at 40° to HP and perpendicular to VP. Draw its projections.
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Solution Diagram
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Step-by-Step Construction
- 1
In the view perpendicular to the inclined plane, circle shows true shape
- 2
Top view: Circle projects as an ellipse
- 3
Front view: Circle projects as straight line (plane perpendicular to VP)
- 4
Draw auxiliary projection perpendicular to line of intersection with HP
- 5
In this view, draw 60mm diameter circle
- 6
Project points back to obtain ellipse in top view
- 7
Major axis = diameter, Minor axis = diameter × cos(40°)
Pro Tips
- •Always verify your measurements with a scale before finalizing the drawing
- •Use construction lines lightly and darken the final solution
- •Label all important points and reference lines clearly