Textbook of Engineering Drawing, Second Edition

6.22 Textbook of Enginnering Drawing------------------

o ,...

1ft ..,

o·

+--f""':---+--+---I'--y

b

Fig. 6.31

Problem : Draw the projections of a pentagonal pyramid with a side of base 30mm and axis

70mm long when (i)one of its triangular faces is perpendicular to HP and (ii)one of its

slant edges is vertical.

Construction (Fig.6.32)

Fig. 6.32

1. Draw the projections of the pyramid assuming that it is resting on its base on H.P with an
   edge of the base perpendicular to V.P.
   Case (i)

2. Redraw the front view such that the front view of the face oeD is perpendicular to xy (the

line olcl( dl).