Answer :

if you are referring to a rectangle, then the total length would be:
length = 2(42) + 2(9) = 84 + 18 = 102
the total length of a rectangle with those measurements is 102 inches

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Rewritten by : Barada

si te refieres a un rectangulo la longitud va hacer 102 pulgadas.
2(42) + 2(9)= 84+18=102