Verified Answer :

iGreen

Just put an exponent of '2' on the scale factor and multiply it by the surface area.

Scale factor = 2

\(\sf2^2\rightarrow4\)

Multiply it:

\(\sf350\times4=1400~mm^2\)

You would mulitply the factor by itself
2^2 = 4

then you would multiply the surface area by 4 

350 x 4 = 1400 mm^2

Answer 1400 mm^2

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