Surface of the cuboid

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


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

Step-by-step explanation:

b=2/3 a c=2a  S=2(a b+b c+c a) S=2(a 2/3a+2/3a 2a+2a a) S=2(2/3+4/3+2) a2 S=2(2/3+4/3+2) a2  S=8 a2

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