Problem 13.40 A pentagonal prism of base side 30 mm and axis 75 mm stands on its base on the
ground such that one of its rectangular faces is parallel to and nearer the V.P. A thread is wound
around the prism, starting from the corner of the lower base farthest away from the V.P. to the cor-
responding corner of the upper base. Find the minimum length of the thread and show it on the front
view of the prism.
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Explanation:
Given Data
Pentagonal Pyramid
Edge of base = 30 mm
Axis length = 60 mm
Resting on one of its triangular face on (Ground) HP
Top view of an axis is inclined 45° with VP
Apex nearer to observer.
Follow the procedure of Q. 8 and Q. 6 for projections.
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