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annular strip
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An annular strip (the region between two concentric circles) can be cut and bent into a helical strake that follows approximately the contour of a cylinder. Techniques of differential geometry are employed to find the dimensions of the annular strip that will best match the required curvature of the strake.
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An annular strip (the region between two concentric circles) can be cut and bent...
Encyclopædia Britannica, Inc.