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Sgriffin · Answer 1 · 2023-12-18T22:55:44+0000

Here we have to multiply two values of length, so the result will be a value of surface, that means that the result will have the same unit and squared:

$19.3cm\cdot21.0cm\text{ = 405.3 }cm^2$

So, the correct answer is 405.3 cm^2.

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