Respuesta :

Answer:

36 m

Step-by-step explanation:

The area (A) of a square is calculated as

A = s² ( s is the side length )

Here A = 81 , then

s² = 81 ( take the square root of both sides )

s = [tex]\sqrt{81}[/tex] = 9

Perimeter = 4s = 4 × 9 = 36 m

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