Problem attached. I can do the question in a variety of ways, however was unable to understand some of the other methods suggested on the markscheme. Please can someone explain them (centre of circle is (r,4), and intersection of line and circle is at (16/5, 12/5). i) ↕CN = 4 sin p + r cos p Complete method to find r CN = 4 ; with substituted r = 2 I do not understand what N is in the above solution, and do not understand how it was done. The other two solutions are attached. Thanks!