Grady's Geometry Events Board by

Egyptian Pyramids

charlesbarkley — 2024-11-07 12:36:31 UTC

First Egyptian pyramids constructed using masterful planning as well as sharp and detailed understanding of geometrical shapes and concepts.

Herons Formula

charlesbarkley — 2024-11-07 12:37:33 UTC

This was the first known instance of someone correctly mapping the area of a triangle with a pre-determined formula in recorded history.

Moscow Papyrus

charlesbarkley — 2024-11-07 12:38:31 UTC

The Moscow Mathematical Papyrus was a document discovered containing 25 new ideas in mathematical and geometrical history.

Rhind Papyrus

charlesbarkley — 2024-11-07 12:39:20 UTC

The Rhind Papyrus was an 18 feet wide document containing 48 new problems revolving mostly around dealing with fractions.

2's Square Root

charlesbarkley — 2024-11-07 12:39:49 UTC

Baudhayana, author of the Baudhayana Sulba Sutra, a Vedic Sanskrit geometric text, contains quadratic equations, and calculates the square root of 2 correct to five decimal places

The Shatapatha Brahmana

charlesbarkley — 2024-11-07 12:40:38 UTC

The Shatapatha Brahmana is a prose text describing Vedic rituals, history and mythology associated with the Śukla Yajurveda.

Brahmagupta's Formula

charlesbarkley — 2024-11-07 12:41:16 UTC

Brahmagupta's formula: The area, A, of a cyclic quadrilateral with sides of lengths a, b, c, d, respectively, is given by

Pythagorean Triples

charlesbarkley — 2024-11-07 12:41:54 UTC

The other Vedic “Sulba Sutras” (“rule of chords” in Sanskrit) use Pythagorean triples, contain of a number of geometrical proofs, and approximate π at 3.16

Pappus Of Alexandria

charlesbarkley — 2024-11-07 12:43:02 UTC

Pappus of Alexandria states his hexagon theorem and his centroid theorem

The Nine Chapters on the Mathematical Art

charlesbarkley — 2024-11-07 12:43:45 UTC

The Nine Chapters on The Mathematical Art lays out an approach to mathematics that centers on finding the most general methods of solving problems

Renee Descartes

charlesbarkley — 2024-11-07 12:44:27 UTC

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

Calculus

charlesbarkley — 2024-11-07 12:45:04 UTC

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

Classification of finite simple groups

charlesbarkley — 2024-11-07 12:46:16 UTC

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

Greeks use numerals

charlesbarkley — 2024-11-07 12:47:17 UTC

First recorded incident of written numerals in Greece

Plato's Polyhedra

charlesbarkley — 2024-11-11 12:31:36 UTC

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

Eudoxus Rational and Irrational Comparison

charlesbarkley — 2024-11-11 12:32:02 UTC

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

The Elements

charlesbarkley — 2024-11-11 12:34:39 UTC

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.

Volume of a cylinder

charlesbarkley — 2024-11-11 12:36:56 UTC

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

The Earth's Circumference

charlesbarkley — 2024-11-11 12:37:29 UTC

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

Area of an Encircled Quadrilateral

charlesbarkley — 2024-11-11 12:38:05 UTC

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

Three Cottage Problem Disproved

charlesbarkley — 2024-11-12 12:31:08 UTC

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?"

The Fractal Geometry Of Nature

charlesbarkley — 2024-11-12 12:31:49 UTC

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

Classification of finite simple groups

charlesbarkley — 2024-11-12 12:32:24 UTC

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

Mapping of E8

charlesbarkley — 2024-11-12 12:33:12 UTC

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