Let rr  be the position vector of any point on the line, then the
vector equation of the line is given by
ˆ
ˆ
ˆ
(
3
5
6 )
r
i
j
r=− + −k
+ λ 
ˆ
ˆ
ˆ
(2
4
2 )
i
j
k
+
+
11 4  Angle between Two Lines
Let L1 and L2 be two lines passing through the origin
and with direction ratios a1, b1, c1 and a2, b2, c2,
respectively Let P be a point on L1 and Q be a point
on L2 Consider the directed lines OP and OQ as
given in Fig 11