A spiral such that the angle between the tangent and the radius vector is the same for all points of the spiral. Also called logarithmic spiral.
- The evolute and the involute of an equiangular spiral is an identical equiangular spiral.
- A sawtooth road, for instance, requires a wheel pasted together from pieces of an equiangular spiral.
- Given a set of equiangular lines, let c be the cosine of the common angle.
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