Q.
Through the point P(3,4) a pair of perpendicular lines are drawn which meet x-axis at the point A and B. The locus of incentre of triangle PAB is
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a
x2−y2−6x−8y+25=0
b
x2+y2−6x−8y+25=0
c
x2−y2+6x+8y+25=0
d
x2+y2+6x+8y+25=0
answer is B.
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Detailed Solution
PI = r cosec 450 ⇒PI2=2r2