Step 1

The picture below shows the square with the sides of length L.

Step 2

Since the value of the area is given as 16in², we can substitute A with 16 as shown below:

Step 3

Now, we have L² = 16. Since L square is a multiplication of L two times, we can find L by taking the square root of 16. This is shown below:

Step 4

Now, the calculated number 4, has no meaning until we include the unit for it. Since the area is in in², L will be in inch. Hence:

L = 4 in

Step 5

Therefore, the answer is B.

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