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The area of a square is 81 square inches. What is the perimeter?

 Feb 6, 2020
 #1
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Area of square = \(s^2\) where, \(s\) is the side length of the square.

\(81=s^2\)

\(9=s\) 

s must be positive since it is a side length, so the negative root of 81 is rejected.

Perimeter= \(4s\) 

Perimeter=\(4(9)=36\) \(inches\)

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 Feb 6, 2020
 #2
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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:

 

sqrt"a".

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

 Feb 6, 2020

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