Final answer:
To find the perimeter of the new rectangle, you need to calculate the lengths of all four sides by applying the scale factor to the original dimensions. The perimeter of the new rectangle is the sum of the lengths of all four sides.
Step-by-step explanation:
To find the perimeter of the new rectangle, we need to find the lengths of all four sides. If the original rectangle has a width of 3 cm and a length of 8 cm, and we use a scale factor of 3 to create the scale copy, the new rectangle will have a width of 3 cm x 3 = 9 cm and a length of 8 cm x 3 = 24 cm.
The perimeter of a rectangle is calculated by adding the lengths of all four sides. So, the perimeter of the new rectangle is 9 cm + 24 cm + 9 cm + 24 cm = 66 cm.
Therefore, the correct answer is not listed in the provided options.