Question 800811
Perimeter of a square 
= 4s {one side multiplied by 4}


4s = 84 {set 4s equal to given perimeter, 84}
s = 21 {divided each side by 4}


Area of a square 
= s² {area of a square is one side, squared}
= 21² {substituted side length, 21, into area formula}
= 441 {squared the 21}


Area of a square garden is 441 ft²
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