The area of a square is 81 square inches. What is the perimeter?
Area of square = \(s^2\) where, \(s\) is the side length of the square.
s must be positive since it is a side length, so the negative root of 81 is rejected.
Well, let's make the area "a".
And to calculate an area is a^2.
So if we want to find just one side, we can square root it:
In this case, it's sqrt81 = 9.
Which means that one side is 9.
To find the perimeter of a square, we multiply by 4, or we can add up one side 4 times:
9*4 OR 9+9+9+9 = 36.
Perimeter = 36