Answer:
12 units
Explanation:
You want to know the perimeter of rectangle ABCD after it has been dilated by a factor of 1.
Perimeter
The original rectangle ABCD has a perimeter of ...
P = 2(L +W) = 2(4 +2) = 12
The perimeter of the dilated rectangle is the original perimeter multiplied by the dilation factor:
P' = 12ยท1 = 12
The dilated rectangle has a perimeter of 12 units.
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Additional comment
Dilation by a factor of 1 changes nothing at all. The center of dilation is irrelevant.