The vertices of a triangle ABC are A(2, 3, 1), B(-2, 2, 0) and C(0, 1, -1).Find the magnitude of the line joining mid points of the sides AC and BC.
Find the area of the triangle formed by joining the mid-points of the sides whose vertices are (0, -1), (2, 1) and (0, 3). Also find the ratio of the given triangle to the newly formed triangle.