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References to 'construction of central proportional'
1. continuity of sine and cosine by pahio
2. high school mathematics by matte
3. index of entries on compass and straightedge constructions by Wkbj79
4. polar tangential angle by pahio
5. properties of regular tetrahedron by pahio
6. Pythagorean triplet by drini
7. rational sine and cosine by pahio