A Text Book on Engineering Graphics - Central Board of Secondary ...

Example:13:
Solution :
b
B
O
B
b
O
50
HELPING FIGURE
Fig 1.13
ISOMETRIC PROJECTION
Draw the isometric projection of an inverted triangular pyramid of base side 50
mm and axis of 80 mm keeping one of its base side parallel to V.P. and nearer the
observer.
Refer Fig. 1.14
a
50
a
HELPING FIGURE
A
A
B
B
C
F
ISOMETRIC PROJECTION
Fig 1.14
14 ENGINEERING GRAPHICS
b 30°
C
O
30°
a
50
50
80
ISOMETRIC PROJECTION
a
30°
b
O
30°
A
F
A
80