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Home > PC > Chapter 1 > Lesson 1.3.2 > Problem 1-116


The circle to the right has a radius of one meter.

  1. How many degrees are in a half circle?

    It is half of or .

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

    Since the circumference of the circle is , the answer is . So what is the arc length of half of the circle?

  3. Using exact values, what is the length of ? You will have as part of your answer.

    What part of the circumference will 60° have?

Circle with diameter endpoint labeled, a, radius with endpoint on the circle labeled, b, central angle corresponding to the arc between a & b, labeled 60 degrees.