and 
If 
and m very subject to the condition 
then the locus of its circumcentre is
A)
B)
C)
D)
Correct Answer: A
Solution :
Coordinates of circumcentre are   Hence, |
 |
 ?(i) |
 ?(ii) |
| Squaring and adding Eqs. (i) and (ii), we get |
 [Putting ] |
Hence,  |
Therefore, the locus is  |
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