Learn the differences between length , height, and breadth (or width) and how they are used in various fields. Length is the longest dimension, height is the vertical dimension, and breadth is the width of an object. Length and Breadth As we know, a rectangle contains two dimensions namely length and breadth as given in the below figure. Here, length = l and breadth = b. These two dimensions are used to find the length of the boundary of the shape, i.e. perimeter and area. How to Measure Length ? The length of any object can be found in either way such as using a scale (i.e., ruler), measuring tape and so on. These tools are generally used to measure the length of the given objects. Ruler is used for ... The area of the rectangle is dependent on the length and breadth of the rectangle, it is the product of the length and the breadth of the rectangle. The area of a rectangle is measured in square units, i.e. in m2, cm2, etc. The length , followed by the breadth , the height, and finally the other dimensions, are always expressed in that order. This indicates that if a box’s dimensions are to be measured, they should be stated as length , breadth , and height.