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Question

A perpendicular is drawn from the point A(1,8,4) to the line joining the points B(0,−1,3) and C(2,−3,−1). The co-ordinates of the foot of the perpendicular is:

A
(53,23,193)
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B
(53,23,193)
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C
(53,23,193)
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D
(53,23,193)
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Solution

The correct option is D (53,23,193)
Equation of line BC is : x2=y+12=z34
Any point D on the line can be taken as: (2t,2t1,4t+3)
Now, DA=(12t,9+2t,1+4t)
For foot of perpendicular, DA.(2i2j4k)=0
24t184t416t=0
t=56
Hence, we have D=(53,23,193)


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