If D is the mid-point of side BC of a triangle ABC such that write the value of λ.

Question

Philoid · Accepted Answer

Let the position vectors of A, B and C be and

Then the position vector of will be

Any vector , if the position vectors of point A () and B () are known, can be written as .

Then,

⇒

Substituting value of , we get

⇒ or λ=2