Important Points to remember<br />The shortest distance between two skew lines is the line segment perpendicular to both lines.<br />If l, m, n are the direction cosines, and a, b, c are the direction ratios of the line, then the direction cosines are given by: <br /> <br /> <br /> <br /> <br />Skew lines are the lines that lie in different planes. They are neither parallel and nor intersecting.<br /> <br /> <br />The cartesian equation of a line that passes through the points (x1, y1, z1) and (x2, y2, z2) is given by<br /> <br /> <br /> <br /> <br />The equation of the plane that passes the three non-collinear points (x1, y1, z1), (x2, y2, z2) and (x3, y3, z3) is<br /> <br /> <br /> <br />The equation of the plane which cuts the coordinate axes at (a, 0, 0), (0, b, 0) and (0, 0, C) is given by<br /> <br /> <br /> <br /> <br />
