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Sagot :

[tex] \qquad\qquad\huge\underline{{\sf Answer}}{} [/tex]

Surface area of a cube is :

[tex]\qquad \tt \dashrightarrow \:6 {a}^{2} [/tex]

where, a represents side length of each edge.

[tex]\qquad \tt \dashrightarrow \:a = 6(6.4) {}^{2} [/tex]

[tex]\qquad \tt \dashrightarrow \:a = 6(40.96)[/tex]

[tex]\qquad \tt \dashrightarrow \:a = 245.76 \: \: unit {}^{2} [/tex]

it can be taken as an approximate of :

[tex]\qquad \tt \dashrightarrow \:a \approx245.8 \: \: unit {}^{2} [/tex]

Answer:

The answer is D. 245.8 unit^2