Euclid's Elements Redux

• 1 Angles, Parallel Lines, Parallelograms
• 2 Rectangles
• 3 Circles
• 4 Inscription and Circumscription
• 5 Theory of Proportions
• 6 Applications of Proportions
• 7 Elementary Number Theory
• 8 Proportions & Geometric Sequences 
• 9 Applied Number Theory
• 10 Irrational Numbers
• 14 Solutions

"Euclid's 'Elements' Redux" is an open textbook on mathematical logic and geometry based on Euclid's "Elements" for use in grades 7-12 and in undergraduate college courses on proof writing.

Many problem solvers throughout history wrestled with Euclid as part of their early education including Copernicus, Kepler, Galileo, Sir Isaac Newton, Ada Lovelace, Abraham Lincoln, Bertrand Russell, and Albert Einstein. This edition is part of an effort to ensure that tomorrow's great thinkers will have that same privilege.