D, E and F are the mid-points of the sides BC, CA and AB respectively of `Delta ABC` and G is the centroid of the triangle, then `vec(GD) + vec(GE) + vec(GF) = `

If D,E and F be the middle points of the sides BC,CA and AB of the Delta ABC, then AD+BE+CF is

If D,E and F are the mid-points of the sides BC, CA and AB respectively of a triangle ABC and lambda is scalar, such that vec(AD) + 2/3vec(BE)+1/3vec(CF)=lambdavec(AC) , then lambda is equal to

D, E and F are the mid-points of the sides BC, CA and AB of a triangle ABC. Show that BDEF is a parallelogram

If D E and F be the mid ponts of the sides BC, CA and AB respectively of the /_\ABC and O be any point, then prove that vec(OA)+vec(OB)+vec(OC)=vec(OD)+vec(OE)+vec(OF)

In the adjoining figure D, E and F are the mid-points of the sides BC, AC and AB respectively. triangle DEF is congruent to triangle :

If D,E,F are the mid points of the side BC,CA and AB respectively of a triangle ABC,write the value of vec AD+vec BE+vec CF