Question

What are collinear points

Answer 1

Three or more points P_1, P_2, P_3, ..., are said to be collinear if they lie on a single straight line L. A line on which points lie, especially if it is related to a geometric figure such as a triangle, is sometimes called an axis.

Two points are trivially collinear since two points determine a line.

Three points x_i=(x_i,y_i,z_i) for i=1, 2, 3 are collinear iff the ratios of distances satisfy

x_2-x_1:y_2-y_1:z_2-z_1=x_3-x_1:y_3-y_1:z_3-z_1.

Answer 2

Collinear means in a line... Point that exist in one line are called colinear..