Triangle stv was dilated with the origin as the center of dilation to form s't'v'. what is the scale factor of the dilation?

A dilation is a transformation that produces an image that is the same shape. The triangle for this question is shown below. The choices for this question is as follows:

1/3
2/3
3/2
3/1

I believe the correct answer is 1/3. The scale factor an be calculated by dividing the corresponding measurements of both shapes. In this case we can use the height. 4/12 = 1/3

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