In law of resistance length, cross section area resistively is the main term of this law.
There are two basic laws of resistance. The resistance formula is
(i)Law of length: The resistance of a conductor is proportional to its length when the temperature, cross section area and its material is fixed.
If the resistance wire is R and the length is L.
A long wire resistance is more and short wire resistance is less when the both wire is made of same material and same cross section.
(ii) Law of cross section area: The resistance is inversely proportional to its cross section area when the length, temperature and material remain fixed.
If the resistivity of conductor is R and the cross section area is A.
That means when the length and material of a conductor is fixed, resistance of a thin wire is more and it is less for thick wire.