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References to 'diameter'
1. angle of view of a line segment by pahio
2. Apollonius' circle by drini
3. area of a spherical triangle by Mathprof
4. area of spherical calotte by means of chord by pahio
5. Beltrami-Klein model by Wkbj79
6. circle by PrimeFan
7. circumferential angle is half the corresponding central angle by rm50
8. cissoid of Diocles by pahio
9. conjugate diameters of ellipse by pahio
10. construction of central proportional by pahio
11. construction of tangent by pahio
12. converting between the Beltrami-Klein model and the Poincar\'{e} disc model by Wkbj79
13. example of using residue theorem by pahio
14. finite projective plane by Mathprof
15. harmonic division by pahio
16. hypotenuse by CWoo
17. orthogonal circles by pahio
18. pi by mathcam
19. Poincar\'e disc model by Wkbj79
20. proving Thales' theorem with vectors by pahio
21. Ptolemy's theorem by drini
22. Simon Stevin by PrimeFan
23. sines law proof by drini
24. vibrating string by perucho
25. \v{S}tefan Zn\'am by Mravinci