What is the area of a square having a perimeter of $20$ cm?

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Solution

Perimeter is four times the side of a square or sum of all its four sides.

So we know,
$20 = s + s + s + s$
$4 s = 20$
Dividing both sides be $4$
$s = 5$

So, the area will be $5 \times 5 = 25$ square cm

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