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Q.

If O is the origin and OP and OQ are the tangents from the origin to the circle x2+y26x+4y+8=0, then the circumcenter of triangle OPQ is

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a

(3,2)

b

(32, -1)

c

(34, -12)

d

(-32, 1)

answer is B.

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Detailed Solution

Question Image

Clearly, OPCQ is a cyclic quadrilateral. Then the circumcircle of OPQ passes through the point C.
For this circle, OC is diameter. Then the center is the midpoint of OC, which is (32, -1).

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If O is the origin and OP and OQ are the tangents from the origin to the circle x2+y2−6x+4y+8=0, then the circumcenter of triangle OPQ is