The earliest mention of pi comes from over 4000 years ago: the ancient Babylonians calculated the area of a circle by taking 3 times the square of its radius. One Babylonian tablet (ca. 1900-1680 BC) indicates a value of 3.125 for pi.
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he had something to do with pi
2+2=5.pi
Archimedes (287-212 BC) was supreme and greatest Greek mathematician. He solved the problem of buoyancy. He established the laws of the lever. He Devised a method of displacement volumes (the Eureka formula).he Made creative war machines to fight off the Romans. He Invented calculus (although this was forgotten)
It is the same as in Unicode - 32 letters: alpha, beta, gamma, delta, epsilon, digamma, stigma, zeta, heta, eta, theta, iota, yot, kappa, lamda, mu, nu, xi, omicron, pi, san, koppa, rho, sigma, tau, upsilon, phi, chi, psi, omega, sampi, sho Source: list of all symbols tagged *GREEK*LETTER* in allkeys.txt on Unicode website
Small list of great inventions/achievements of ancient China, and various other Chinese "firsts": - Paper - Printing - Compass - Gunpowder - Bell - Ax - Drum - Beer - Fork - Pasta - Oars/rowing - Table salt - Silk - Rice/soybean cultivation - Acupuncture - Anti-malarial compounds - Paper currency - Various metallurgic technologies - Blast furnace - Mechanical belt drive - Drilling - Cast iron - Accurate calendar year - Chemical warfare - Use of chromium - Crossbow - Cold-fusion steel process - Treatment of diabetes - Identification and treatment of malnutrition diseases - Endocrinology - Various achievements in astronomy - Various achievements in geometry and mathematics - Exploding cannonballs - Fireworks - Carriage - Fishing reel - Horse collar/harness - Jade - Kite - Landmine - Various nautical inventions - Match - Natural gas as fuel - Negative numbers - Playing cards - Go/Mahjong/Chinese checkers - Porcelain - Pound lock - Puppet theater - Restaurant menu - Rotary fan - Seismometer - Suspension bridge - Tea - Use of thyroid hormones to treat goiters - Tofu - Toilet paper - Toothbrush - Catapult - Wheelbarrow - Discovery of circadian rhythm - Decimal fractions - Concept of climate change - Music theory - Gaussian elimination - Description of leprosy - Estimate of pi - Recognition of spontaneous combustion - Concept of true north - Recognition of sunspots, and various other astronomical phenomena - Accurate description of solar eclipse