Today is Pi Day 2019, when we celebrate the ‘most important number in maths.’
Pi is the ratio of the circumference of a circle to its diameter, which is approximately 3.14159.
While you might think the number doesn’t apply to you, pi is actually all around you – whether it’s checking your watch or seeing the wheels of a vehicle go by.
Here are some of the most interesting facts and figures about pi.
1. It dates back to 1706
The Greek symbol ‘π’ was first used by William Jones in 1706.
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Pi
However, it wasn’t until 1737 that the use of π became popular, after it was adopted by Swiss mathematician, Leonhard Euler.
2. Google tricks
Google ’s one step ahead of you if you try to use pi in an equation.
If you type the word ‘pi’ into Google, the calculator will automatically appear with 3.14159265359 already entered!
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3. Mirror tricks
Hold a mirror up to 3.14, and it will spell PIE – delicious!
4. The big picture
To accurately calculate the volume of our entire universe, you only need 39 digits past the decimal!
5. Useful formulae with pi
Those of you who did GCSE maths may remember some of these handy equations:
The area of a circle = πr2
Where ‘r’ is the radius (distance from the centre to the edge of the circle).
The circumference of a circle = πd
Where ‘d’ is the diameter (distance from one edge of the circle to the other).
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Circle
6. There’s a pibased sport!
In 2008, a sport based on the number was invented in South Africa.
The game is similar to beach volleyball, but is played on a circular court, and instead of being separated by a net, players stand opposite one another within the court.
7. No zeroes
Amazingly, there are no zeroes in the first 31 digits of Pi.
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8. Dejavu
The first six digits of Pi, 314159, appear in that order at least six times among the first ten million decimals of Pi.
9. Star Trek fame
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In one episode of the original Star Trek series, Spock destroys a computer by asking it to reveal the last digit of Pi.
10. Pi recall world record
While most of us struggle to remember many digits beyond 3.14, one man in Japan has managed to remember a staggering 111,700 digits!
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