Definitions:
We can re-parameterize a curve so that it is parameterized by arc length, and then the tangent vector at a point r(s) on a curve of unit length. This means that for a curve parameterized by arc length is also a function of s. |
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Definitions:
Go to the discover page to see the a tangent angle in action.
Turning Angle![]() Definition: The turning angle of a curve from s1 to s2 is Answer some questions about the tangent and turning angles on the practice page. |
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A famous theorem states that if the signed curvature is known as a function of arc length and the starting point and starting tangent direction are given, then the curve is completely determined. This is not so surprising, given that the curvature determines the turning angle at all points along the curve as indicated in the formula in the preceding paragraph.