(page490)

From the attachment, P, Q, R are suppose to be different points.

In the figure above, ABCD is a rectangle with BC=4 and AB=6. Points P, Q, and R are different points on a line (not shown) that is parallel to line segment AD. Points P and Q are symmetric about line AB and points Q and R are symmetric about line CD. What is the length of line segment PR?

The correct answer is 8. Can you kindly show me the steps?

Thanks in advance