Vectors 1 Question 21

22. A,B,C and D, are four points in a plane with position vectors a,b,c and d respectively such that

(ad)(bc)=(bd)(ca)=0

The point D, then, is the… of the ABC.(1984,2M)

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Answer:

Correct Answer: 22. (b)

Solution:

  1. As, (ad)(bc)=(bd)(ca)=0

ADBC and BDCA

which clearly represents from figure that D is orthocentre of ABC.



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