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Best know for his 13 book treatise "The Elements" collecting the theorems of Phythagoras, Hippocrates, Theaetetus, Eudoxus and other predecessors into a logically connected whole.
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He develop a theory of forms, in his book "Phaedo", which considers mathematical objects as perfect forms (such as a line having but no breadth).
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He wrote the first "Elements of Geometry" which Euclid may haved used as a model for his own Books I and II more than a hundred years.
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He brought the science of geometry from Egypt to Greece. Discovery of 5 facts of elementary geometry (including that an angel in a semi-circle is a right angle).
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They made geometry understandable to people and they made our life easier to learn geometry.
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Mrs. Lumbre teaches us geometry the way the 6 mathematicians made how geometry works in our life.
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He is credited with proving many theorems such as the angles of a triangle summing to 180 degrees, and the infamous "Pythagorean Theorem" for a right angled triangle.
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He is the greatest Greek mathematician and an inventor of many mechanical devices like screw, pully and lever. He is know as the "Father of Mechanics".