. The distance of the point
(-1, 2, 6) from the line 
is equal to
A. 7 units
B. 9 units
C. 10 units
D. 12 units
Best Answer
Ans: A
Sol: Any point on the line is
P = (6r1 + 2, 3r1 + 3, –4r1 –4).
Direction ration of the line segment PQ, where Q = (–1, 2, 6), are
6r1 + 3, 3r1 + 1, – 4r, – 10.
If ‘P’ be the foot of altitude drawn from Q to the given line, then
6(6r1 + 3) + 3(3r1 + 1) + 4(4r1 + 10) = 0.
r1 = –1.
Thus, P = (–4, 0, 0)
Required distance= 
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