Answer:
![b = (A)/(h)](https://img.qammunity.org/2021/formulas/mathematics/high-school/fp2hiq5tja3ohhg6o9gq7aog2hhx85h538.png)
Explanation:
Given the formula for calculating the area of the rectangle as;
A = bh where;
b is the length of the base of the rectangle, and;
h is the height of the rectangle
Required
Make b the subject of the formula
Given
![A = bh\\\\divide \ both \ sides \ by \ h\\(A)/(h) = (bh)/(h)\\ (A)/(h) = b\\Re-arrange;\\b = (A)/(h)](https://img.qammunity.org/2021/formulas/mathematics/high-school/jgkzkdzqo9gwlbpdflwz88bvnjkx866wfc.png)
Hence the value of b in terms of A and h is expressed as
![b = (A)/(h)](https://img.qammunity.org/2021/formulas/mathematics/high-school/fp2hiq5tja3ohhg6o9gq7aog2hhx85h538.png)