Concentric circles with center G have radii 5 and 11 as shown.

2 concentric circles with center G are shown. The smaller circle has a radius of 5 and the larger circle has a radius of 11.

Which would prove that the circles are similar?

Dilate the smaller circle by a factor of .

If the circles were not concentric, what additional step would be needed to prove they are similar?

one of the circles so that the circles have the same center.