1.

In three dimensions there may be more than one point, which are equidistant from three given non-collinear points A, B, C. One of these points will be circumcentre of the triangle ABC. The y-coordinate of orthocenter of the triangle ABC.

Answer»

`(3A^(2)c^(2)-a^(2)b^(2)-b^(2)c^(2))/(a^(2)b^(2)+b^(2)c^(2)+c^(2)a^(2)).b`
`(ab+b^(2)-ac)/(a+b+c)`
`b-(2(a^(2)c^(2)+b^(4)))/(a^(3)+b^(3)+c^(3))`
none of these

Answer :A


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