Circle Similarity Practice Test

Circle $\odot E$ has center $E$ and radius $8$. Circle $\odot F$ has center $F$ and radius $4$. Which transformation maps $\odot E$ to a circle congruent to $\odot F$?

Two circles are drawn on a coordinate plane: Circle $\odot P$ has center $P(-2,1)$ and Circle $\odot Q$ has center $Q(4,-1)$. Their radii are different, and the centers are marked. Which transformation maps $\odot P$ to a circle similar to $\odot Q$ using similarity transformations (not formulas)?