Pi Day by John Hartery https://padlet.com/jhartery/piday Questions on Pi en-us 2016-03-09 09:01:20 UTC 2023-01-27 11:47:54 UTC hello@padlet.com http://hd.wallpaperswide.com/thumbs/pi-t2.jpg What famous scientist was born on “Pi Day,” a date more commonly known as March 14th? aoifemcgrath https://padlet.com/jhartery/piday/wish/99873039 Albert Einstein]]> 2016-03-09 09:15:11 UTC https://padlet.com/jhartery/piday/wish/99873039 markhartery https://padlet.com/jhartery/piday/wish/99873141 2016-03-09 09:15:48 UTC https://padlet.com/jhartery/piday/wish/99873141 markhartery https://padlet.com/jhartery/piday/wish/99873349 2016-03-09 09:17:12 UTC https://padlet.com/jhartery/piday/wish/99873349 What is the 40,000th decimal place of pi? https://padlet.com/jhartery/piday/wish/99873367 1

]]> 2016-03-09 09:17:17 UTC https://padlet.com/jhartery/piday/wish/99873367 https://padlet.com/jhartery/piday/wish/99873524
]]> 2016-03-09 09:18:18 UTC https://padlet.com/jhartery/piday/wish/99873524 We can never truly measure the circumference or the area of a circle because we can never truly know the value of pi. Pi is an irrational number, meaning its digits go on forever in a seemingly random sequence markhartery https://padlet.com/jhartery/piday/wish/99873820 What is irrational???]]> 2016-03-09 09:20:12 UTC https://padlet.com/jhartery/piday/wish/99873820 ruairchannan https://padlet.com/jhartery/piday/wish/99873823 2016-03-09 09:20:13 UTC https://padlet.com/jhartery/piday/wish/99873823 https://padlet.com/jhartery/piday/wish/99873887 2016-03-09 09:20:36 UTC https://padlet.com/jhartery/piday/wish/99873887 Both π and the letter p are the sixteenth letter in the Greek and English alphabets, respectively markhartery https://padlet.com/jhartery/piday/wish/99873937

]]> 2016-03-09 09:21:03 UTC https://padlet.com/jhartery/piday/wish/99873937 The first 144 digits of pi add up to 666 (which many scholars say is “the mark of the Beast”). And 144 = (6+6) x (6+6).d markhartery https://padlet.com/jhartery/piday/wish/99874031 2016-03-09 09:21:42 UTC https://padlet.com/jhartery/piday/wish/99874031 In 1995, Hiroyoki Gotu memorized 42,195 places of pi and is considered the current pi champion. Some scholars speculate that Japanese is better suited than other languages for memorizing sequences of numbers. markhartery https://padlet.com/jhartery/piday/wish/99874104 How many places can you memorize??]]> 2016-03-09 09:22:10 UTC https://padlet.com/jhartery/piday/wish/99874104 How many hours did it take a supercomputer to calculate pi to 51.5 billion digits, in 1997? https://padlet.com/jhartery/piday/wish/99874121 just over 29 hours

]]> 2016-03-09 09:22:16 UTC https://padlet.com/jhartery/piday/wish/99874121 Pi is transcendental. What does this mean, in mathematics? https://padlet.com/jhartery/piday/wish/99874358 It cannot be expressed as an integer, or as a root or quotient of integers]]> 2016-03-09 09:23:43 UTC https://padlet.com/jhartery/piday/wish/99874358 https://padlet.com/jhartery/piday/wish/99874681 2016-03-09 09:25:43 UTC https://padlet.com/jhartery/piday/wish/99874681 The circumference of the earth is approx. 40,075 km, What is this divided by pi? markhartery https://padlet.com/jhartery/piday/wish/99876409 The average radius of the Earth is 3,959 miles (6,374 kilometers).
The equitorial diameter of the Earth (distance from one side of the Earth to the other at the equator) is about 7,926 miles.


The ratio of the circumference to the diameter of a circle (circumference/diameter) 
is written as the symbol pi. 
Pi is approximately 3.141592.
3.14159265
3.1415926535


Therefore, to determine the circumference from the diameter given above:
equitorial diameter x 3.141592 = equitorial circumference
| |
7,926 x 3.141592 = 24,900
| |
The earth has a circumference of approximately 24,900 miles.


More precisely the circumference of the earth
at the equator is 24,902 mi / 40,076 km. 


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How fast would you have to travel to see the sun set twice, 
or outrun the shadow of the setting sun?

Since the sun "travels" once around the earth every 24 hours, 
we can get the speed by dividing the circumference of the earth by 24:

miles divided by hours
| |
24,900 / 24 = 1,038 miles per hour



]]> 2016-03-09 09:36:59 UTC https://padlet.com/jhartery/piday/wish/99876409 https://padlet.com/jhartery/piday/wish/99876596 The symbol for pi (π) has been used regularly in its mathematical since only for the past 250 years.]]> 2016-03-09 09:38:14 UTC https://padlet.com/jhartery/piday/wish/99876596