The circle at right has a radius of one meter. 

1. How many degrees are in a half circle?

   Hint (a):

   It is half of $360°$.

2. What is the length of the arc that covers half of the circle?

   Hint (b):

   The circumference of the circle is $2\pi(1\text{m})$. What is half of the circumference?

3. Using exact values, what is the length of  $\overparen {\textit{AB}}$? You will have $\pi$ as part of your answer.

   Hint (c):

   What part of the circumference will $60°$ have?

   More Help (c):

   What is $\frac{1}{6}$ of the circumference?