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References to 'ruled surface'
1. cone in $\mathbb{R}^3$ by pahio
2. cylinder by stevecheng
3. developable surface by pahio
4. Euclidean geometry of space by pahio
5. example of integration with respect to surface area on a helicoid by rspuzio
6. generatrices of hyperbolic paraboloid by pahio
7. generatrices of one-sheeted hyperboloid by pahio
8. integration with respect to surface area on a helicoid by rspuzio
9. level curve by pahio
10. line of curvature by pahio
11. Pl\"ucker's conoid by Mravinci
12. surface integration with respect to area by rspuzio
13. surface normal by pahio
14. tilt curve by pahio