A piece of string is $30$ cm long. What will be the length of each side, if the string is used to form a square?

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Solution

Let the side of square is $a$ cm.
Perimeter of the square $= 4 a$
$\Rightarrow 4 a = 30$
$\Rightarrow a = \frac{30}{4} = 7.5 c m$

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