Given pi r squared = 2 pi r + 110. Using pi = 22/7, (22/7) r (r - 2) = 110, so r(r - 2) = 35 = 7 x 5, giving r = 7. Diameter = 2r = 14 units.
Note: The NTA key marks 7 units, which equals the radius; we have given the diameter as explicitly asked in the question.