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The scale factor used to create the image is 2.
This can be determined by looking at how the x and y coordinates of each vertex have changed. For example, the x-coordinate of point A has changed from -13 to -32.5, which is a change of 19.5. Similarly, the y-coordinate of point A has changed from -4 to -10, which is a change of 6.
Since both changes are multiplied by the same number, the scale factor is 2.