<s>
In	O
geometry	O
,	O
true	B-Application
length	I-Application
is	O
any	O
distance	O
between	O
points	O
that	O
is	O
not	O
foreshortened	O
by	O
the	O
view	O
type	O
.	O
</s>
<s>
In	O
a	O
three-dimensional	O
Euclidean	O
space	O
,	O
lines	O
with	O
true	B-Application
length	I-Application
are	O
parallel	O
to	O
the	O
projection	O
plane	O
.	O
</s>
<s>
For	O
example	O
,	O
in	O
a	O
top	O
view	O
of	O
a	O
pyramid	O
,	O
which	O
is	O
an	O
orthographic	O
projection	O
,	O
the	O
base	O
edges	O
(	O
which	O
are	O
parallel	O
to	O
the	O
projection	O
plane	O
)	O
have	O
true	B-Application
length	I-Application
,	O
whereas	O
the	O
remaining	O
edges	O
in	O
this	O
view	O
are	O
not	O
true	B-Application
lengths	I-Application
.	O
</s>
<s>
If	O
any	O
face	O
of	O
a	O
pyramid	O
was	O
parallel	O
to	O
the	O
projection	O
plane	O
(	O
for	O
a	O
particular	O
view	O
)	O
,	O
all	O
edges	O
would	O
demonstrate	O
true	B-Application
length	I-Application
.	O
</s>
<s>
Examples	O
of	O
views	O
in	O
which	O
all	O
edges	O
have	O
true	B-Application
length	I-Application
are	O
nets	O
.	O
</s>
