Diameter of a cylinder

The diameter of the cylinder is 42 cm. How many times does the cylinder turn on a 66m long track?

Correct result:

n =  50

Solution:

D=42 cm→m=42/100 m=0.42 m s=66 m  o=π⋅ D=3.1416⋅ 0.42≐1.3195 m  n=s/o=66/1.3195=50D=42 \ cm \rightarrow m=42 / 100 \ m=0.42 \ m \ \\ s=66 \ \text{m} \ \\ \ \\ o=\pi \cdot \ D=3.1416 \cdot \ 0.42 \doteq 1.3195 \ \text{m} \ \\ \ \\ n=s/o=66/1.3195=50

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