- #1

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## Homework Statement

show that the curvature of a plane curve is [tex]\kappa=|\frac{d\phi}{ds}|[/tex] where phi is the angle between

**T**and

**i**; that is, phi is the inclination of the tangent line.

## Homework Equations

## The Attempt at a Solution

I'm not sure how to start this one out.

Any ideas?