Q. 93.9( 39 Votes )

Find the position vector of a point R which divides the line joining two points P and Q whose position vectors are externally in the ratio 1 : 2. Also, show that P is the midpoint of the line segment RQ.

Answer :

Given: points are given.

Point R is given which divides P and Q in the ratio 1:2.


Then





position vector of R is


And position vector of mid-point of RQ =



Hence, P is mid-point of the line segment RQ.


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