Breadth of rectangle formula: If we know the area and length of a rectangle , we can find the breadth using the area formula by substituting the values or we can reframe the area formula as, Breadth = Area of rectangle ÷ Length . One of the recent discussions I showed last week dealt with the meaning of length , and I promised more about that. Here we will look at some older questions about the ambiguity of words like length , width, depth, and height. Is length the longest dimension? Our first question is from 1999: What is Length in a Rectangle? According to the Webster's Ninth Collegiate Dictionary, length means "the longer or longest dimension of an object." So the length of a rectangle is the longest side whether ... Length , width and height are the three dimensions that define the physical world around us. Learn more with Brighterly. 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.