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Question Number 205106 by mr W last updated on 08/Mar/24

Commented by mr W last updated on 10/Mar/24

https://youtu.be/FUHkTs-Ipfg?si=59bDLBxJIY5Zk5cY

Answered by mr W last updated on 08/Mar/24

Commented by mr W last updated on 08/Mar/24

$$r=1$$$$R=3$$$$r\phi =R\theta$$$$rotationofcircleA:$$$$\varphi =\theta +\phi =(1+\frac{R}{r})\theta =4\theta$$$$with\theta =2\pi :$$$$\varphi =4\times 2\pi =8\pi ,i.e.4revolutions$$

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