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WZ
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Problem 48 Easy Difficulty

Show that the curvature of a plane curve is $\kappa=|d \phi / d s|,$
where $\phi$ is the angle between $T$ and $\mathbf{i} ;$ that is, $\phi$ is the
angle of inclination of the tangent line.

Answer

$$
k=\frac{d \phi}{d s}
$$

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Video Transcript

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WZ
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