Question

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

a.1/12
b.1/10
c.1/8
d.1/6

Answer 1

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