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References to 'collinear'
1. AAS is not valid in spherical geometry by Wkbj79
2. central collineations by Algeboy
3. concyclic by CWoo
4. conic section by drini
5. contact point by Mathprof
6. cotriangular space by pan
7. Desargues' theorem by drini
8. Euclidean vector by mathwizard
9. Euler line by drini
10. example of multiply transitive by Algeboy
11. Hough transform by madmortigan
12. incidence geometry by CWoo
13. inflection points and canonical forms of non-singular cubic curves by rspuzio
14. limiting triangle by Wkbj79
15. line in plane by matte
16. linear ordered geometry by Mathprof
17. Menelaus' theorem by mathwizard
18. midpoint by Mathprof
19. Newton's line by vmoraru
20. ordered geometry by CWoo
21. Pappus's theorem by drini
22. Pascal's mystic hexagram by drini
23. perpendicular bisector by CWoo
24. perspectivity by CWoo
25. polarity by Algeboy
26. polygon by Mathprof
27. projective geometry by Algeboy
28. projectivity by CWoo
29. proof of AAA (hyperbolic) by Wkbj79
30. proof of Desargues' theorem by drini
31. proof of Pappus's theorem by mathcam
32. proof of Pascal's mystic hexagram by mathcam
33. proof of Simson's line by giri
34. proof of uniqueness of center of a circle by CWoo
35. Simson's line by drini
36. syzygy by CWoo
37. tangent plane (elementary) by rspuzio
38. triple scalar product by slider142
39. trisection of angle by Wkbj79