1. The Father of Geometry Brit Caswell
Euclid
The Father of Geometry
Brit Caswell

2. Euclid’s Life Birth/death dates unknown Lived in Alexandria
Lived in times of Ptolomy I (367BC - 283BC)
Platonic school of thought
Wrote the Elements

3. Other works
Only FIVE pieces of Euclid’s original works have survived today
“Data”, which discusses information given in Geometry
“On Divisions of Figures”, which looks at areas of figure
“Catoptrics”, which looks at the theory of mirrors
“Phaenomena”, which talks about spherical astronomy
“Optics”, which looks at perspective

4. Lost Works
Most of Euclid’s work has been lost. However, these works have been referred to by other mathematicians.
Conics
Porisms, which is an extension of conics
Pseudaria, the Book of Fallacies, discusses errors in logic
Surface Loci, believed to be about quadric surfaces
Mechanics, has several books discussing real items, such as the physics of levers

5. The Elements What is a proof?
The elements structured mathematics for 23 centuries
Mostly geometry, some number theory
There are 5 postulates, however only the first 4 have been proven
The first 28 propositions in the Elements do not use the parallel postulate
In 1823, Janos Bolyai and Nicolai Lobachevsky each discovered other forms of geometry in which the 5th postulate did not hold

6. Sources
Artmann, Benno (1999). Euclid: The Creation of Mathematics. New York: Springer. ISBN
Heath, Thomas L. (1981). A History of Greek Mathematics, 2 Vols. New York: Dover Publications. ISBN / ISBN

7. Exit Ticket On a sheet of paper, please write the following:
Your name, date, and class period
One thing that you enjoy about math
One thing that you don’t enjoy about math
One thing that you wish to learn this year
Three things that you are interested in or do for fun
Have a great day!