The formula to convert inches to square inches is:
\[ SI = L \times W \]
Where:
Square inches are a unit of area that describes a total area equal to 1 inch in length and 1 inch in width, hence the name, square inches. Square inches are denoted with the symbol in².
Let's assume the following values:
Step 1: Multiply the length by the width:
\[ 5 \times 4 = 20 \]
The area in square inches (SI) is 20 in².