In electronics equipments,for design propose,why same length of two resistors are used?please back me...?

In electronics devices, for differ values resistance , mostly the length of resistors are
same,But different cross-sectional area :why?what it signify.....?
Answers:
the answer is pretty simple if you look at the formula for resistance it is :
R = (ro)*l/A
where on earth ro => specific resistance; l => length of the wire; A => area of cross - portion of the wire.
thus by keeping the length of the flex constant we can vary the resistance by varying the area of cross - sector.
sometimes to allow better heat dissipation wires with more A r used.

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