Describing the Position of an Object

How can the position of an object be described?

Certain positions of a particle are described below. Which of the two positions lie on the same straight line$?$

$\left(\mathrm{a}\right) 2 \mathrm{m}, 30° \mathrm{NE}$               $\left(\mathrm{b}\right) 5 \mathrm{m}, 30° \mathrm{NE}$                $\left(\mathrm{c}\right) 5 \mathrm{m}, 30° \mathrm{SW}$                $\left(\mathrm{d}\right) 2 \mathrm{m}, 60° \mathrm{SW}$

Show the location of a point on a graph which is $5 \mathrm{m}$ and $45°$ north to east.

Describe the position of an object lying in between the two Cartesian axis (N & E) at a distance of $5 \mathrm{m}$ from the reference point. 

Which two parameters are to be specified for describing the position of an object?