Thales and The Egyptians

Thales lived about 624 BC to 547 BC in Miletus, Asia Minor (now Turkey)

"Water is the principle, or the element, of things. All things are water." 
Quoted in Plutarch, Placita Philosophorum

Thales MacTutor Bio 

Thales Theorum    

Selections from String Straightedge & Shadow

Philosophy of Thales

High School Level Thales Synopsis 

Thales Circle Applet

Thales of Miletus proved that any triangle inscribed in a semicircle will be a right triangle (10th Grade) Problem #25

Mr.Pitonyak's Pyramid Puzzle

Build a Scale Model of the Great Pyramid

Thales is Famous for Measuring the Height of the Great Pyramid using ratios 

Mathematical Contributions