en.wikipedia.org/wiki/Euclid%27s_Elements

Euclid's Elements is a mathematical and geometric treatise consisting of 13 books attributed to .... Book 1 contains Euclid's 10 axioms (5 named 'postulates'— including the parallel postulate—and 5 named 'common notions') and the basic ...

aleph0.clarku.edu/~djoyce/elements/bookI/bookI.html

When a straight line standing on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing ...

aleph0.clarku.edu/~djoyce/elements/bookI/propI1.html

Describe the circle BCD with center A and radius AB. Again describe the circle ...

www.perseus.tufts.edu/hopper/text?doc=Euc.+1

BOOK I. DEFINITIONS. 1. A point is that which has no part. 2. A line is breadthless length. 3. The extremities of a line are points. 4. A straight line is a line which ...

farside.ph.utexas.edu/Books/Euclid/Elements.pdf

The Elements consists of thirteen books. Book 1 outlines the fundamental propositions of plane geometry, includ- ing the three cases in which triangles are ...

math.furman.edu/~jpoole/euclidselements/eubk1/props.htm

Euclid's Elements. Book I ... If in a triangle two angles be equal to one another, the sides which subtend the equal angles will also be equal to one another.

www.math.tamu.edu/~dallen/history/euclid/euclid.html

Feb 14, 1997 ... No other book except the Bible has been so widely translated and ... The Elements -- Book I. Definitions -- 23. 1. A point is that which has no ...

www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/non_Euclid_Euclid/Elements.html

Definitions, Postulates, Axioms and Propositions of Euclid's Elements, Book I ... A plane angle is the inclination to one another of two lines in a plane which meet ...