
![<b>The reason is that, the letters or variables in a literal equation are like parameters that can be any real number.</b>]()
A literal equation has two or more variables or letters, that are used to represent real values.
An example is the perimeter of a square, which is given by the formula,

Here, the P represents perimeter of the square and l represents the length of the square.
Since the length of a square can assume any positive value,the above literal equation has

.
For instance, if


and so on and so forth.
Other examples of literal equations include:
The perimeter of a rectangle, which is given by the formula:

The formula for finding the perimeter of a circle:

The set of values that satisfy the above formulas are infinitely many.