Question

Which transformation was performed on PQRS to form P'Q'R'S'?

A dilation factor of 2
A dilation factor of 4
A dilation factor of 1/2
A dilation factor of 1/4

Answer 1

Remember what a dilation does, it shrinks or stretches a figure. You can see that this is a shrink, since it gets smaller. If it gets smaller, what should the dilation factor be, greater or less than one?

Answer 2

@jnst_alex
The dilation factor k is the length measure of image (the new figure) divided by the corresponding length measure of preimage (old figure).
For example,
k=P'Q'/PQ, or k=Q'R'/QR....
whichever is easier to calculate.
k>1 means the image is bigger (stretching), and
k<1 means the image is smaller (contraction)