An arc subtends an angle of 1050 at the center of a circle of a circle of radius 6 cm. find the length of the arc, if the π is 22/7

Answer 1

set ε={3,6,9,12,15,18,21,24,27,30}
What is n(ε)?

Answer 2

s = rθ
There are only 360° in a full circle, so I'm not sure how your arc can subtend an angle of 1050. Anyway, just express θ and multiply by r.

n(ε) is just the number of elements in the set. Surely you can count ...