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## Main Question or Discussion Point

In feynman lectures on physics volume 1

Excerpt 11-6

I don't get how the equation \begin{equation*} \Delta v_\perp=v\,\Delta\theta \end{equation*} is found.

Excerpt 11-6

I don't get how the equation \begin{equation*} \Delta v_\perp=v\,\Delta\theta \end{equation*} is found.