1.

The position vectors of four points A, B, C and D in the plane are vec(a),vec(b),vec( c ) and vec(d). If (vec(a)-vec(d)).(vec(b)-vec( c ))=(vec(b)-vec(d)).(vec( c )-vec(a))=0 then D is a ………………is DeltaABC.

Answer»

In CENTRE
CIRCUM centre
ortho centre
CENTRIOD

ANSWER :C


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