Question

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Answer 1

`the\ perimeter\ of\ a\ rectangle=the\ perimeter\ of\ a\ square\\\\2\cdot(12+6)=4x\\\\2\cdot18=4x\ \ \ \Rightarrow\ \ \ 4x=36\ /:4\ \ \ \ \Rightarrow\ \ \ x=9\\\\Ans.\ the\ length\ of\ each\ side\ of\ a\ square\ is\ 9\ in.`

Answer 2

Rectangle sides have length 12 and 6, so it's perimeter is 2*12+2*6=24+12=36

Square has 4 sides equal in length so we divide 36/4=9

Length of each side of the square is 9 in.

It is not necessary to put so many question marks into question :)