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Byju's Answer
Standard XII
Mathematics
Image of a Point with Respect to a Plane
Write directi...
Question
Write direction cosines of a line parallel to z-axis.
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Solution
A
line
parallel
to
z
-
axis
,
makes
an
angle
of
90
°
,
90
°
and
0
°
with
the
x
,
y
and
z
axes
,
respectively
.
Thus
,
the
direction
cosines
are
given
by
l
=
cos
90
°
=
0
m
=
cos
90
°
=
0
n
=
cos
0
=
1
Therefore
,
direction
cosines
of
a
line
parallel
to
the
z
-
axis
are
0
,
0
,
1
.
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