How many times will circle A revolve around itself in total ?
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Solution
Let \(R\) the radius of the circle \(B\) and \(r\) the radius of the circle \(A\).
The center of the circle \(A\) travels around a circle of radius \(R+r\), Not \(R\).
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So the solution is
\[\begin{aligned}
\frac{2\pi(R+r)}{2\pi(r)}&= \frac{R}{r} + 1\\\\
&= \frac{3r}{r} + 1\\\\
&= 4
\end{aligned}\]
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