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Question

The surface area of the cube is $729 m^{2}$ . Find its length.

$11.01$ m
$11.05$ m
$11.02$ m
$11.06$ m

A

11.05

m

B

11.02

m

C

11.01

m

D

11.06

m

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Solution

Verified by Toppr

Surface area of the cube $=$ $6 \times$ side $^{2}$
$∴ 729 = 6 \times s^{2}$
$∴ \frac{729}{6} = s^{2}, 121.5 = s^{2}$
$∴ s = \sqrt{121.5}$
$∴$ side $= 11.02$ m
So, option C is correct.

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