We know that, the points and lines can be drawn on a plane surface. Plane surfaces are those which are two dimensional surfaces. Points are said to be collinear if they lie on the same line. Set of lines which pass through the same point are called the concurrent lines.
In this section we shall discuss about coplanarity. Also when we study three dimensional geometry we learn about the direction ratios, direction cosines and the equation of the planes and the lines. We shall also discuss few examples on coplanar points, lines etc.