Show that the three points ( 4,2),(7,5) and (9,7) lie on a straight line .

Show that the points A (4, 2), B (7, 5) and C (9, 7) are three points lying on a same line.

Show that the line through the points (4,7,8),(2,3,4) is parallel to the line through the points (-1,-2,1), (1,2,5)

The points (1, 1), (-5,5) and (13, lambda ) lie on the same straight line if lambda=

Show that the points A(4, 7 ) B (8,4) and C(7,11) are the vertices of a right angled triangle.

Show that the four points (1,0), (2,-7), (8,1) and (9,-6) are concyclic.

Show that the points (1, 3), (2, 1) and (1/2, 4) are collinear, by using using a straight line and

show that the straight line passing through the points A (6,7,5) and B (8,10,6) is perpendicular to the straight line passing through the points C (10, 2,-5) and D (8,3,-4).

Using section formula , show that the points A(7,-5),B(9,-3) and C(13,1) are colliner.