### Home > PC > Chapter 1 > Lesson 1.3.2 > Problem1-116

1-116.

It is half of 360° or 180°.

Since the circumference of the circle is 2π(radius), the answer is 2π(1). So what is the arc length of half of the circle?

What part of the circumference will 60° have?

$\frac{1}{6}\text{ of\ the\ circumference\ or\ }\frac{2\pi}{6}$