# Cube

The sum of all cube edges is 30cm. Find the surface area of the cube.

Result

S =  37.5 cm2

#### Solution:

$s=30 \ \text{cm} \ \\ a=s/ 12=30/ 12=\dfrac{ 5 }{ 2 }=2.5 \ \text{cm} \ \\ \ \\ S=6 \cdot \ a^2=6 \cdot \ 2.5^2=\dfrac{ 75 }{ 2 }=37.5 \ \text{cm}^2$

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Showing 1 comment:
Dr Math
>>> Is the sum of all edges 30 or 80?

typo fixed, thank you!

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