For Pi Day 2016 I tried to calculate π by hand, using an infinite series. It goes ok.

Before you even start:
— Yes, I know π Day requites writing the date MM/DD. By objective measures: the wrong way. I dont care. My love of π is stronger.
— My opinion of Tau is a matter of public record: youtu.be/ZPv1UV0rD8U

CORRECTIONS:
— At 17:23 it should be π/4 not 1/π. That was contamination from the next graphic. (First spotted by Najeeb Sheikh and Jake Trookman.)

Check out y-cruncher:
www.numberworld.org/y-cruncher/internals/formulas.html

Calculating pi by weighing a circle:
www.youtube.com/watch?v=Ngj0a57Rlb0

Calculating pi with a pendulum:
www.youtube.com/watch?v=qYAdXm69l8g

Music by Howard Carter
Design by Simon Wright

MATT PARKER: Stand-up Mathematician
Website: standupmaths.com/
New book: makeanddo4D.com/
Nerdy maths toys: mathsgear.co.uk/