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The coordinates of the circumcentre o...

The coordinates of the circumcentre of the triangle formed by the points `O\ (0,\ 0)` , `A(a ,\ 0)` and `B(0,\ b)` are `(a ,\ b)` (b) `(a/2, b/2)` (c) `(b/2, a/2)` (d) `(b ,\ a)`

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