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Question

A line segment of 2 units is sliding with its ends on two perpendicular lines. Then the locus of the middle point, is

A
x+2y+1=0
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B
x2+y2=1
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C
y2=4ax
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D
x2=4ay
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Solution

The correct option is B x2+y2=1
Let (h,k) be the middle point of (0,a) and (b,0)
a=2k and b=2h
Using distance formula we have
(2h)2+(2k)2=2
Squaring on both the sides, we have
(2h)2+(2k)2=4
h2+k2=1
Locus of the point will be x2+y2=1

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