The Solution:
Polar representation is similar to a rectangular plane representation since every polar form has its equivalent in a rectangular plane representation.
Difference: Polar representation is different from rectangular representation in terms of form and the parameters used in defining each of the two cases.
Below is a diagrammatical presentation of the polar plane and the rectangular plane:
From the above diagram, the trig ratio and the Pythagorean Theorem are applied to get the equations.
On the better form to use:
The better one to use depends on which is required in the question, which is more suitable in the situation, and which of them will be easier to compute.