Below are all of my previous Pi Day posts (at least the ones I can find)
- Calculate Pi with a Raspberry Pi – this includes my favorite Monte Carlo Method for finding pi with random numbers.
- 6 Things you probably didn’t know about Pi – just random stuff.
- Finding the area of actual circles to find a value for Pi.
- Numerical calculation of circumference to find pi.
- Scratch version of Monte Carlo calculation of Pi – the link to the scratch code is borked, but you get the idea.
- Finding Pi by plotting diameter vs. circumference – you know, for kids.
- Finding Pi with a pendulum.
- This is probably my first post using random numbers to find Pi.
- Why is there a relationship between Pi and the local gravitational constant (g)?
- Using the digits of Pi as a random number generator to calculate pi.
- What is the best fractional representation of Pi? – this one is good, I recommend it.
- Finding the value of pi with a mass and a spring.
- Finding the best fractional representation of pi – part II (more fractions).
- The value of Pi and random walks.
- Numerical integration of the area of a circle to find Pi
- How many digits of Pi do you really need?
- Why is there so much Pi in physics?
- How do you write Pi in binary? What about writing numbers in base-Pi?
- Why is there a connection between pi and g (the gravitational field)?
Rhett Allain's Stuff 
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