To find the length of each side of a square when you know the area, you can use the formula for the area of a square:
Area = side × side
In this case, we know the area of the square is 400 square miles. Let’s denote the length of each side as s. Therefore, we can set up the equation:
s × s = 400
This simplifies to:
s² = 400
To find the value of s, we need to take the square root of both sides:
s = √400
Calculating the square root of 400 gives us:
s = 20
So, the length of each side of the square is 20 miles. This means if you were to measure each side of the square, it would be 20 miles long.