This is my favourite bit from that website Helen:
“Measures 9 inches in diameter x 2 inches tall, which is enough information for you to figure the volume”
For an interesting spin on this idea (which I saw some time ago on Twitter), if a pizza has radius z, and a height (including toppings) equal to a, then
volume = pi · z · z · a
Happy Epic Pi Day 
Hoyden About Town 
Ooh, what kind of pie shall I make? We don’t have enough limes on the tree. Harrumph. Maybe I’ll pull out frozen berries…
I’ve made a pi pie like that too!
Such clever people! I have lots of the tireds and so will not be making any pies tonight.
Lucky PI, gets two days each year
Pi approximation day is 22 July (22/7=3.14)
Maybe today is it’s name day.
You could always make puy pie…
Mr angharad made this once and it was very good.
This is what I gave my science-y niece for Xmas last year.
http://laughingsquid.com/pi-cake-pan/
This is my favourite bit from that website Helen:
“Measures 9 inches in diameter x 2 inches tall, which is enough information for you to figure the volume”
Cos they’re science-y, unlike me!
For an interesting spin on this idea (which I saw some time ago on Twitter), if a pizza has radius z, and a height (including toppings) equal to a, then
volume = pi · z · z · a