3/14/2013~ Happy Pi Day!
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3/14/2013~ Happy Pi Day!
by WeAreTheWorld. Wed Mar 13, 2013 9:57 pm
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Pi Day is celebrated on March 14th (3/14) around the world. Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159.
Pi has been calculated to over one trillion digits beyond its decimal point. As an irrational and transcendental number, it will continue infinitely without repetition or pattern. While only a handful of digits are needed for typical calculations, Pi’s infinite nature makes it a fun challenge to memorize, and to computationally calculate more and more digits.
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The first 1 million digits of pi:
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LEARN ABOUT PI
Pi (π) is the ratio of a circle’s circumference to its diameter. Pi is a constant number, meaning that for all circles of any size, Pi will be the same.
The diameter of a circle is the distance from edge to edge, measuring straight through the center. The circumference of a circle is the distance around.
HISTORY OF PI
By measuring circular objects, it has always turned out that a circle is a little more than 3 times its width around. In the Old Testament of the Bible (1 Kings 7:23), a circular pool is referred to as being 30 cubits around, and 10 cubits across. The mathematician Archimedes used polygons with many sides to approximate circles and determined that Pi was approximately 22/7. The symbol (Greek letter “π”) was first used in 1706 by William Jones. A ‘p’ was chosen for ‘perimeter’ of circles, and the use of π became popular after it was adopted by the Swiss mathematician Leonhard Euler in 1737. In recent years, Pi has been calculated to over one trillion digits passed its decimal. Only 39 digits past the decimal are needed to accurately calculate the spherical volume of our entire universe, but because of Pi’s infinite & patternless nature, it’s a fun challenge to memorize, and to computationally calculate more and more digits.
GEOMETRY
The number pi is extremely useful when solving geometry problems involving circles. Here are some examples:
The area of a circle.
A = πr2
Where ‘r’ is the radius (distance from the center to the edge of the circle). Also, this formula is the origin of the joke “Pies aren’t square, they’re round!”
The volume of a cylinder.
V = πr2h
To find the volume of a rectangular prism, you calculate length × width × height. In that case, length × width is the area of one side (the base), which is then multiplied by the height of the prism. Similarly, to find the volume of a cylinder, you calculate the area of the base (the area of the circle), then multiply that by the height (h) of the cylinder.
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A few fun random facts about pi:
Thirty-nine decimal places of pi suffice for computing the circumference of a circle girding the known universe with an error no greater than the radius of a hydrogen atom.
One of the earliest known records of pi was written by an Egyptian scribe named Ahmes (c. 1650 B.C.) on what is now known as the Rhind Papyrus. He was off by less than 1% of the modern approximation of pi (3.141592)
The first million decimal places of pi consist of 99,959 zeros, 99,758 1s, 100,026 2s, 100,229 3s, 100,230 4s, 100,359 5s, 99,548 6s, 99,800 7s, 99,985 8s, and 100,106 9s.a
”Pi Day” is celebrated on March 14 (which was chosen because it resembles 3.14). The official celebration begins at 1:59 p.m., to make an appropriate 3.14159 when combined with the date. Albert Einstein was born on Pi Day (3/14/1879) in Ulm Wurttemberg, Germany
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This is such a fun holiday to be a part of. Every year in school since 4th grade we have always celebrated this day in math class. Last year in geometry we all chipped in money to buy pizzas. We measured the pizza before consuming and explored the pi ratio. We even had a contest to see who in the class could memorize the most numbers of pi- about 6 years ago a man set the record for the most digits of pi memorized with 100,000 digits! I used to only know around the first 30 digits but I doubt I can remember it now lol.
This year in Pre-Cal since it's the first class of the day we are getting chicken biscuits from a restaurant up the street from my school and waffles. Since pi is not as big of a deal in this class as it was geometry last year we will probably still have regular class tomorrow- just with the added circular goodies which is always a plus
Happy pi day!
WeAreTheWorld.- Posts : 1967
Join date : 2012-07-22
Age : 27
Location : United States
Re: 3/14/2013~ Happy Pi Day!
by midangerous Wed Mar 13, 2013 10:16 pm
I remember learning about Pi when I was in high school, but I didn't know the 14th of March was Pi day, very interesting, thank you for that info WATW, and I hope you're doing better.
midangerous- Posts : 3098
Join date : 2012-07-23
Age : 34
Location : United States
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