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25 July, 21:27

What part of the circumference is an arc whose measure is 30°?

a. 1/12

b. 1/10

c. 1/8

d. 1/6

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Answers (1)
  1. 25 July, 22:18
    0
    Circumference of a circle:

    C = 2 r π;

    Length of an arc:

    L = r π α / 180°

    L = r π · 30° / 180° = r π / 6

    r π / 6 : 2 r π = 1/6 : 2 = 1/12

    Answer: A) 1/12
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