Disc

Circumference of the disk is 78.5 cm. What is the circumference of the circular arc of 32° on the disc?

Correct result:

o =  24.9873 cm

Solution:

o1=78.5 cm  o1=2 πr r=o1/(2π)=78.5/(2⋅ 3.1416)≐12.4937 cm  o=2⋅ r+o⋅ 32360=2⋅ 12.4937+24.9873⋅ 32360=24.9873 cm

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