Question

Find the centroid of a triangle, mid-points of whose sides are (1, 2, -3), (3, 0, 1) and (- 1, 1, - 4).

Or

The mid-points of the sides of a triangle are (1, 5, - 1), (0, 4, - 2) and (2, 3, 4). Find its vertices.

Answer 1

(1, 1, -2)

or

(1, 2, 3), (3, 4, 5) and (-1, 6, -7)