. . Condition for a line to lie in a plane We observe that a straight line will lie in a plane if every point on the line, lie in the plane and the normal to the plane is perpendicular to the line. (i) If the line r tb lies in the plane r n , then a n b n (ii) If the line lies in the plane Ax By Cz D , then Ax By Cz D aA bB cC Vector - - Example .
Verify whether the line lies in the plane