Introduction To Three Dimensional Geometry

Let -plane divide the join of points and in the ratio
= 0 = 0

The two lines

and are perpendicular if
= 0
= - 14

Answer (d)

Coordinates of centroid of

But it is given that origin is the centroid of

On comparing both sides, we get
and
and
and

Let divides externally in

By external section formula, we get






Hence, divides in the ratio (externally).