Find the circumference of the circle that is within a square if the area of the square is $81$ $c m^{2}$
Take $π = \frac{22}{7}$

27

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25.25

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28.27

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24.20

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Solution

The correct option is B $28.27$
Area of square $= 81 c m^{2}$
$a^{2} = 81$
$a (s i d e) = 9$ cm
$a = d$

d(diameter) $= 9$

Circumference $= π d$

$= \frac{22}{7} \times 9$

$= 28.27$ cm.

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