Surface of the cuboid

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

Correct answer:

S = 8*a^2

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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