The surface area of a cube is $441 m^{2}$ . Find its side.

8.5

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8.2

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8.1

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8.4

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Solution

The correct option is A $8.5$ m
Total surface area of a cube $=$ $6 \times$ side $^{2}$
$441 = 6 \times s \times s$
$\frac{441}{6} = s^{2}$
$s^{2} = 73.5$
Side $= 8.5$ m

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