Sorry but i am not exactly sure my work proved as wrong each time
Answer:
length of the arc = 6 units
Step-by-step explanation:
3n = (n+2) + 18
2n = 20
n = 10
So: 10, 11, 12
A regular polygon<span> is equilateral (it has equal sides) and equiangular (it has equal angles). To </span>find the area of a regular polygon<span>, </span>you<span> use an apothem — a segment that joins the </span>polygon's<span> center to the midpoint of any side and that is perpendicular to that side (segment HM in the following figure is an apothem).
Hope this helps tho I cant help with #2 sorry</span>