1.

Let ABC be a triangle whose circumcentre is at P. If the position vectors of A, B, C and P are bar(a), bar(b), bar(c) and (bar(a)+bar(b)+bar(c))/4 respectively, then the position vector of the orthocentre of this triangle is

Answer»

`-((bar(a)+bar(B)+bar(C))/2)`
`bar(a)+bar(b)+bar(c)`
`(bar(a)+bar(b)+bar(c))/2`
`bar(0)`

Answer :D


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