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Question

If the sum of the distances of a moving point from two perpendicular lines in a plane is always 1, then, its locus is

A
Parabola
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B
Ellipse
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C
Hyperbola
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D
None of these
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Solution

The correct option is D None of these
Suppose that the perpendicular line are drawn as xaxis and yaxis.
Then sum of distance from the point P(x,y) is 1
|x|+|y|=1
This would be the locus of the point P which would be a square whose sides are
x+y=1, x+y=1,xy=1, xy=1

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