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References to 'quadrilateral'
1. area of a quadrilateral by Mathprof
2. circumcircle by yark
3. compass and straightedge construction of parallel line by pahio
4. complete quadrilateral by vmoraru
5. crossed quadrilateral by pahio
6. cycle by mps
7. cyclic quadrilateral by drini
8. derivation of first formula for surface integration with respect to area by rspuzio
9. isosceles trapezoid by Wkbj79
10. kite by yark
11. Lambert quadrilateral by Wkbj79
12. Newton's line by vmoraru
13. opposing angles in a cyclic quadrilateral are supplementary by rm50
14. orthocenter by Mathprof
15. parallelogram by drini
16. parallelogram theorems by pahio
17. pencil of conics by pahio
18. polygon by Mathprof
19. polygon by Wkbj79
20. proof of AAA (hyperbolic) by Wkbj79
21. proof of area of a quadrilateral by Mathprof
22. proof of butterfly theorem by drini
23. proof of parallelogram theorems by rm50
24. proof of Ptolemy's inequality by mathwizard
25. proof of Pythagorean theorem by rspuzio
26. properties of parabola by pahio
27. Ptolemy's theorem by drini
28. rectangle by drini
29. regular polygon by Wkbj79
30. rhombus by yark
31. Saccheri quadrilateral by Wkbj79
32. square by drini
33. trapezoid by Wkbj79
34. triangle mid-segment theorem by pahio