Final answer:
The scale factor of dilation is 2.
Step-by-step explanation:
To find the scale factor of dilation, we need to compare the lengths of the corresponding sides of the two polygons. In this case, AD corresponds to QR. If the length of AD is 6 units and the length of QR is 12 units, the scale factor can be found by dividing the length of QR by the length of AD:
Scale factor = QR/AD = 12/6 = 2
Therefore, the scale factor of dilation is 2.