Unit 2SectionsHARD
True Shape of Section of a Pentagonal Pyramid
A pentagonal pyramid, base 40mm side and axis 70mm long, has its base on HP with one edge of the base perpendicular to VP. It is cut by a section plane perpendicular to VP and inclined at 45° to HP, bisecting the axis. Draw the sectional top view and true shape of section.
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Solution Diagram
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Step-by-Step Construction
- 1
Draw the base of the pyramid in top view with one edge perpendicular to VP
- 2
Project the pyramid in front view with height 70mm
- 3
Draw the cutting plane at 45° to HP, bisecting the axis
- 4
Determine the points of intersection on each edge
- 5
Project these points to get the sectional top view
- 6
Use auxiliary projection to obtain the true shape of section
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