2 Timeline of Pi 240 B.C. – Archimedes found pi to be 22/7 150 A.D. to 1650 – Pi was computed to 35 decimal places1706 – Symbol for pi introduced1949 – The first modern computer computed pi to 2,037 decimal places in 70 hours1999 – A Japanese professor calculates the most decimal places ever computed using a super computerAs computers grow faster and more powerful, pi should also get much larger and massive.
3 Importance of PiThe Pi number enters into all branches of mathematics:TheoreticalPhysicsChemistryAstronomyThe universe could not operate properly without the number piut
4 Important Facts About Pi Pi is perhaps the most mathematical constantPi day is celebrated on the same day of Albert Einstein’s birthdayThe symbol π comes from a Greek letter for the ratio of a circle’s circumference to its diameterThe symbol π appears in many different formulas that have nothing to do with circlesThe Egyptians and Babylonians were the one who discovered pi
5 Different Formulas of Pi Formulas for CirclesA = π•r^2C = 2 π•rFormulas for SpheresS = 4π•r^2V = 4/3 π•r^3
6 Machin-like FormulasMachin-like formulas are the best know method to calculate piThe name comes from a professor John Machin who taught at Gresham college during the early 1700sZacharias Dase used the Machin-like formula to calculate 200 pi decimals in his head
7 Pi In CirclesTo find the area and radius of a circle you need certain parts combined with pi, such as: diameter, radius, and circumferenceEuler’s formula is mainly used trigonometric functions and complex exponential function, which requires pi
8 Pi in PhysicsAlbert Einstein used pi for his formula of general relativityPi is not a physical constant in physicsPi appears in several equations describing fundamentals in the principles of the UniverseThe formula for electric force also includes pi, which describes the force between two electric charges
9 Pi in Geometry and Trigonometry Pi is used to find the area and circumference of a circleIt is also used to find the area and volume on spheresPi is often defined using trigonometric functions
10 Works CitedLloyd Motz and Jefferson Hane Weaver. The story of Mathematics. New York: Avon Books, 1993, page 20
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