History of Geometry Timeline

Created and proved Thales Theorem DE/BC=AE/AC=AD/AB

Pythagorean theorem is named after him although its not been proven that he ever even existed
A^2+B2=C2

A set of philosophical problems generally thought to have been devised by Greek philosopher Zeno of Elea

First recorded incident of written numerals in Greece

a philosopher that is highly esteemed by the Greeks. There is a story that he had inscribed above the entrance to his famous school, "Let none ignorant of geometry enter here." However, the story is considered to be untrue.
He was NOT a mathematician however his views helped shape many concepts

After Archimedes died hellenistic geometry started to decline in popularity

Plato founds the Academy in Athens. He identifies five polyhedra now known as Platonic bodies.

Eudoxus makes a definition allowing the possibility of using irrational lengths and comparing them with rational lengths by using cross multiplication.

Euclid is considered to be one of the three greatest mathematicians of all time. He discovered Euclidean geometry which use his axioms and theorems as they relate to plane and solid figures.

Euclid writes The Elements, a book discussing Euclidean geometry. The Elements is a collection of 13 books of definitions, postulates, and axioms. It became the 3rd most popular book in the world, after the Koran and the Bible.

Archimedes is regarded as the greatest Greek mathematician. He invented 3 simple machines, the pulley, screw, and lever. The Archimedes screw, a device used for raising water, is still in use today. He also analyzed the area of a circle and discovered how to calculate volumes and surface areas of spheres and cylinders.

Archimedes discovers the formula for how to calculate the volume of a cylinder.

Eratosthenes estimates the circumference of the Earth, only missing by about 15%.

Brahmagupta created a formula for finding the area of a quadrilateral, with sides a,b,c,d, enclosed by a circle: A = The Sq. Root of (s-a)(s-b)(s-c)(s-d). S is the semi-perimeter, is found by the formula s=(a+b+c+d)/2

Descartes synthesized algebra and geometry by placing points on a coordinate plane.

Putumana Somayaji writes the "Paddhati", which presents a detailed discussion of various trigonometric series

Widely known as a the man who helped revolutionize the concept of gravity Newton made several contributions to mathematics and geometry as well as science including being credited as one of the fathers of calculus.

Leibniz was a German mathematician who is credited as also being a father of modern calculus

Even though there is much controversy surrounding it its widely believed that Sir Isaac Newton and Gottfried Wilhelm Leibniz both discovered/created calculus in the mid 17th century

Gauss developed the Gauss method for adding large amounts of consecutive numbers when he was six. However, his most important creation is that of non-Euclidean geometry. Non-Euclidean geometry is geometry not based on the postulates of Euclid. This includes times when the parallel postulate isn't true. Parallel Postulate - Through a given point not on a line, there is one and only one line parallel to it.

Louis Poinsot discovers the two remaining Kepler-Poinsot polyhedra.

Riemann was one of the foremost geometers in the development of Non-Euclidean Geometry. He also was a lecturer at the University of Gottingen

1854 – Arthur Cayley shows that quaternions can be used to represent rotations in four-dimensional space.

Ferdinand von Lindemann proves that π is transcendental and that therefore the circle cannot be squared with a compass and straightedge,

Casimir Kuratowski shows that the three-cottage problem has no solution
The problem is as follows:
"Suppose there are three cottages on a plane (or sphere) and each needs to be connected to the gas, water, and electricity companies. Without using a third dimension or sending any of the connections through another company or cottage, is there a way to make all nine connections without any of the lines crossing each other?"

In 1982, Benoit Mandelbrot publishing The Fractal Geometry of Nature, a book popularizing fractal geometry. Fractal geometry deals with fractioned dimensions.

the classification of finite simple groups, a collaborative work involving some hundred mathematicians and spanning thirty years, is completed

A team of researches throughout North America and Europe used networks of computers to map E8