Question 112743
PR has to be less than 26.  Why?  Because if PR is equal to 26, that means you've stretched your two segments PQ and QR into a straight line.  That's all the distance you have!

PR also has to be more than 16, because if you start making a smaller and smaller angle until line segment PQ is actually ON line segment QR, the space left for segment PR will be only 16.