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Euclid's Propositions in the Poincare Disk

soundmanbrad, JPC, Aug 23, 2015

1. Euclid's First Proposition in the Poincaré disk
2. Euclid's Second Proposition in the Poincaré disk
3. Euclid's Third Proposition in the Poincaré Disk
4. Euclid's Fourth Proposition in the Poincaré Disk
5. Euclid's Fifth Proposition in the Poincaré Disk
6. Euclid's Sixth Proposition in the Poincaré Disk.
7. Euclid's Seventh Proposition in the Poincaré Disk
8. Euclid's Eighth Proposition in the Poincaré Disk
9. Euclid's Ninth Proposition in the Poincaré Disk
10. Euclid's Tenth Proposition in the Poincaré Disk
11. Euclid's Proposition #11 in the Poincaré Disk
12. Euclid's Twelfth Proposition in the Poincaré Disk
13. Euclid's Thirteenth Proposition in the Poincaré Disk
14. Euclid's Fourteenth Proposition in the Poincaré Disk

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Euclid's First Proposition in the Poincaré disk

Euclid's First Proposition in the Poincaré Disk To construct an equilateral triangle on a given finite straight line. http://aleph0.clarku.edu/~djoyce/java/elements/bookI/propI1.html Describe the circle BCD with center A and radius AB. Again describe the circle ACE with center B and radius BA. Join the straight lines CA and CB from the point C at which the circles cut one another to the points A and B. Now, since the point A is the center of the circle CDB, therefore AC equals AB. Again, since the point B is the center of the circle CAE, therefore BC equals BA. But AC was proved equal to AB, therefore each of the straight lines AC and BC equals AB. And things which equal the same thing also equal one another, therefore AC also equals BC. Therefore the three straight lines AC, AB, and BC equal one another. Therefore the triangle ABC is equilateral, and it has been constructed on the given finite straight line AB.