1.

bara,barb,barc and bard are the position vectors of four coplanar points such that (bara-bard).(barb-barc)=(barb-bard).(barc-bara)=0. Show that the point bard represents the orthocentre of the triangle with bara,barb and barc as its vertices.

Answer»

orthocentre
centroid
incentre
circumcentre

Answer :B


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