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The length of ——ab (the minor arc) is 40 cm. What is the circumference of circle c inside angle is 60 degrees?
s = 2 π r (θ/360°), C = πr^2
40cm = 2πr(1/6)
(40*6)/2π = r
r = 38.1972cm
C = π*(38.1972)^2
C = 4,583.66 cm
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