Question

Triangle A′B′C′ is the image of triangle ABC after a dilation. What is the scale factor of the dilation?

Answer 1

Unfortunately, I can't really explain it that well, but AB is 6, and A'B' is 2.
6 / 3 = 2
BC is 3, and B'C' is 1.
3 / 3 = 1
Therefore the dilation factor would be 1/3.

Hope this helps! :)