Surface of the cuboid

Find the surface of the cuboid if its edges have the dimensions a, 2/3a, 2a

Result

S = (Correct answer is: 8*a^2)

Step-by-step explanation:

$$\begin{gathered} b=2\mathrm{/}3a \\ c=2a \\ S=2(a\cdot b+b\cdot c+c\cdot a) \\ S=2(a\cdot 2\mathrm{/}3a+2\mathrm{/}3a\cdot 2a+2a\cdot a) \\ S=2(2\mathrm{/}3+4\mathrm{/}3+2)\cdot a^2 \\ S=2(2\mathrm{/}3+4\mathrm{/}3+2)\cdot a^2 \\ S=8\cdot a^2 \end{gathered}$$

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