Question
Find the breadth of the rectangle whose perimeter is $360\ cm$ and whose length is: $140\ cm$

Answer

Perimeter of a rectangle $= 2($Length $+$ Breadth$)$
Therefore, Breadth of the rectangle $=\frac{\text{Perimeter}}{2}-\text{Length}$
Perimeter $= 360\ cm$
Length $= 140\ cm$
Breadth $=\frac{360}{2}-140$
$= 180 - 140 = 40\ cm$

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