Respuesta :

Answer:

18

Step-by-step explanation:

the width is 9 meters on two of the sides so 54-18=36 for the two lengths. The length of one side is 18 (36/2)

check answer : length + length + width + width = perimeter

                             18.    +.  18.     + 9.       +.   9.    =54.

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