1.
DEVELOPMENT OF SURFACES

2.
Ex:1
A pentagonal prism of base 30mm and axis
75 mm is resting on H.P on its base such
that a base edge is perpendicular to V.P. A
section plane cuts the axis of the prism at a
distance of 18 mm from the top face and at
angle of 45º with the horizontal. Draw the
development of the truncated prism

3.
X Y
30
T
18
a
b
c
d
e
1
2
3
4
5
b’d’
c’ a’e’
1’5’
2’4’
3’
H
A B C D A
E
1 2 3 4 5 1
h h
k k
m m
75
K
M
30

4.
Ex:2
A hexagonal pyramid of base 40mm and
axis 120 mm is resting on H.P on its base
such that a base edge is perpendicular to
V.P. A section plane cuts the axis of the
pyramid at a height of 45 mm from the base
and at angle of 15º with the horizontal. Draw
the development of the truncated pyramid

5.
a
b
c
d
e
f
o
b’a’ c’f’ d’e’
o’
40
120
X Y
126
45
d1
A
B
C
D
E
A
F
O
P
J
M