# Cube

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

Result

S =  37.5 cm2

#### Solution:

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

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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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