Given a square with the perimeter of 12ft. Find the length of each side of the square.

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

We start with the formula for the perimeter of the square, P=4L. Since the area is given as 12ft, we can substitute P with 12 as shown below:

Now, we have 4L = 12. To find L, we need to divide both sides of the equation with 4. This is shown below:

Now, the calculated number 3, has no meaning unless we include the unit for it. Since the perimeter is in feet, L will also be in feet. Hence:

Clearly, the answer is B.

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