If \[\vec{a},\text{ }\vec{b},\text{ }\vec{c},\text{ }\vec{d}\] are the position vectors of points A, B, C and D respectively such that \[(\vec{a}-\vec{d}).(\vec{b}-\vec{c})=(\vec{b}-\vec{d}).(\vec{c}-\vec{a})=0\] then D is the

Centroid of \[\Delta \text{ }ABC\]

Circumcentre of \[\Delta \,ABC\]

Orthocentre of \[\Delta \,ABC\]

If \[\vec{a},\text{ }\vec{b},\text{ }\vec{c},\text{ }\vec{d}\] are the

1.	If \[\vec{a},\text{ }\vec{b},\text{ }\vec{c},\text{ }\vec{d}\] are the position vectors of points A, B, C and D respectively such that \[(\vec{a}-\vec{d}).(\vec{b}-\vec{c})=(\vec{b}-\vec{d}).(\vec{c}-\vec{a})=0\] then D is the
A.	Centroid of \[\Delta \text{ }ABC\]
B.	Circumcentre of \[\Delta \,ABC\]
C.	Orthocentre of \[\Delta \,ABC\]
D.	None of these
Answer» D. None of these

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If \[\vec{a},\text{ }\vec{b},\text{ }\vec{c},\text{ }\vec{d}\] are the position vectors of points A, B, C and D respectively such that \[(\vec{a}-\vec{d}).(\vec{b}-\vec{c})=(\vec{b}-\vec{d}).(\vec{c}-\vec{a})=0\] then D is the

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