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Q.

Consider a triangle Δ  whose two sides lie on the x-axis and the line x+y+1=0.  If the orthocenter of  Δ  is  (1,1),  then the equation of the circle passing through the vertices of the triangle  Δ is

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a

x2+y2+2y1=0

b

x2+y23x+y=0

c

x2+y2+x+y=0

d

x2+y2+x+3y=0

answer is B.

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Detailed Solution

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Image of orthocentre about any side of the triangle lies on its circucircle.
Question Image
We can observe that x2+y2+x+3y=0  is satisfied by (1,0)  and (1,1)  both 
So, option (B) is the correct choice.

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