11) Then, the direction ratios of the line OP are
x1, y1, z1 Writing the equation of the plane in the normal
form, we have
2
3
4
6
29
29
29
29
x
y
z
−
+
=
where, 
2
3
4
,
,
29
29
29
−
 are the direct ion
cosines of the OP Since d