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The length of a side is 9 centimeters because (9x9=81) The length of the diagonal is 12.72.

Answer: The answer to this math question about finding the length of a side and the diagonal of the square with the given area of the square is 81 square centimetres are 9 centimetres and 12.72 centimetres.

Step-by-step explanation: Here is the briefly short step-by-step explanation, it's because when you actually find the length of a side is 9 centimetres that looks in the basic equation form like this: [tex]9 * 9 = 81,[/tex] that means it still stays the same when you find the length of the side of a square. And also the length of the diagonal of the square is 12.72 centimetres.

I hope that my full short given answer with my full given briefly short step-by-step explanation is very helpful to your own math question about finding the length of a side and the diagonal of the square with the given area of the square, please mark me as Brainliest, take care, always be safe, and have a great rest of the weekend! :D

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Jason Ta,

The Ambitious of The Brainly And The Role of The TDSB And WHCI Student of The High School.