What is the length of RS?

Answer:
The answer should be the second option or 10 cm.
The only thing is that PQ is just a little longer than RS and PQ is 10 cm but A. 15 cm is to long, C. 20 cm is also to long and D. 5 cm is to short.
So i belive it is B. 10 cm.
Hope this helped, can i have brainliest?