Circumference = 2 * PI * radius
circumference = 2 * PI * 12.6
If the central angle is 120°, then the arc will be exactly one third of the circumference.
arc length = (2 * PI * 12.6) / 3
arc length = 8.4 PI
Let the null hypothesis be that the agent's claim is correct. Using a standard normal probability table we find:

The p-value 0.14 is much larger than alpha = 0.01, so we cannot reject the agent's claim.
Answer:
do the work first. and u will get the answer easily.
Hey! There are 7 sides and 7 vertices on a Heptagon. Hope this helps!