Coordinate Geometry | Introduction Coordinate Geometry | Coordinates of a Point Location of the position of a point on a plane requires a pair of co-ordinate axes. The distance of a point from the x-axis is called its y-coordinate, or ordinate. The distance of a point from the y-axis is called its x-co-ordinate or abscissa.…

Sum of n terms of an Arithmetic Progression   Let a be the first term and d be the common difference of an A.P. is the last term where l = a + (n – 1) d. Sum of first n terms of the given A.P. is given by …(i) Writing in reverse order …(ii)…