Answer:
Equation
of line joining points (0, 0, 0) and (2, 1, 1) is given by
i.e.,
Also
equation of line joining points (3, 5, ?1) and
(4,
2, ?1) is given by
i.e.
Now
direction ratios of line L1 are 2, 1, 1 and direction ratios of line
L2 are 1, ?2, 0
As
2 × 1 + 1 × (?2) + 1 × 0 = 2 ? 2 = 0
Lines L1
and L2 are perpendicular to each other.
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