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Question

In triangle ABC, the equation of side BC is xy=0. Circumcentre and orthocentre of the triangle are (2,3) and (5,8) respectively. Equation of circumcircle of the triangle is

A
x2+y24x+6y27=0
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B
x2+y24x6y27=0
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C
x2+y2+4x+6y27=0
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D
x2+y2+4x6y27=0
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Solution

The correct option is D x2+y24x6y27=0
Reflection of orthocenter P(5,8) in BC(xy=0) will lie on circumcircle.
Clearly P1(8,5). Thus, the equation of circumcircle with center O(2,3) and passing through P(8,5) is
(x2)2+(y3)2=(82)2+(53)2
i.e, x2+y24x6y27=0
111121_72145_ans.jpg

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