Find the area of a square park whose perimeter is $320$ m.

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Solution

$p e r i m e t e r o f s q u a r e = 4 \times s i d e$
$320 = 4 \times s i d e$
$s i d e = \frac{320}{4}$
$s i d e = 80 m$
$s o a r e a = s i d e \times s i d e$
$= 80 \times 80$
$= 6400 m^{2}$

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