CPM Homework Help : PC Problem 1-88

The circle below has a radius of one inch. Using exact values, what is the length of $\overarc { AB }$ (shown in bold)? You will have π as part of your answer.

Hint 1:

What part of the circumference is the arc $AB$ ?
How do you know?

Answer 1:

$\text{about the whole circle.}$

Hint 2:

What is the formula of the circumference of a circle?

Answer 2:

$\text{Circumference} = 2π(\text{radius})$

Answer 3:

$\frac{\pi}{2}$