# Cube wall

The perimeter of one cube wall is 120 meters. Calculate the surface area and the body diagonal of this cube.

Result

S =  5400 m2
u =  51.962 m

#### Solution:

$o=120 \ \text{m} \ \\ a=o/4=120/4=30 \ \text{m} \ \\ S_{1}=a^2=30^2=900 \ \text{m}^2 \ \\ S=6 \cdot \ S_{1}=6 \cdot \ 900=5400 \ \text{m}^2$
$u=\sqrt{ 3 } \cdot \ a=\sqrt{ 3 } \cdot \ 30 \doteq 30 \ \sqrt{ 3 } \doteq 51.9615 \doteq 51.962 \ \text{m}$

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