Question

Triangle ABC is similar to triangle PQR, as shown below:

Which equation is correct?
q/c=r/b
c/p=b/a
c/a=q/r
q/b=r/c

Answer 1

I copied and pasted that image then rotated one of the triangles.
I think the answer is the last choice
q/b = r/c

Answer 2

Here's the graphic

Answer 3

Thanks!