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100
Who was the Greek mathematician who first calculated Pi with reasonable accuracy?
Archimedes
100
What is Pi rounded to two decimal places?
3.14
100
What shape is Pi most closely associated with?
Circle
100
What is the 'official' food of Pi Day?
Pie
100
What’s the best way to visualize infinity?
Use a Pi chart
200
Which famous physicist was born on Pi Day in 1879?
Albert Einstein
200
How many digits are in the number Pi?
Infinite
200
Pi is the ratio of a circle's circumference to its what?
Diameter
200
Americans consume this estimated number of pies annually.
156 million to 186 million
200
Why should you never talk to Pi?
It'll go on forever!
300
The computer scientist who set a Guinness World Record in March 2019 by calculating the value of Pi to 31.4 trillion digits.
Emma Haruka Iwao
300
What common fraction is used to approximate Pi?
22/7
300
What is the formula for the area of a circle?
A = pi(r)2
300
What time do enthusiasts sometimes celebrate the most precise 'Pi moment' on Pi Day?
1:59 PM (3.14159)
300
How do you define the volume of a pizza with radius z and thickness a?
Pi(zz)a
400
This Welsh mathematician is credited with first using the Greek letter Pi to represent the mathematical constant in 1706.
William Jones
400
About how many decimal places of Pi have computers calculated?
More than 100 trillion digits
400
What is the sin(pi) equal to?
0
400
On what date is Pi Approximation Day celebrated?
July 22 (22/7)
400
Why should you never argue with Pi?
It's irrational!
500
The Chinese mathematician who calculated Pi with remarkable accuracy around 429–500 AD.
Zu Chongzhi
500
How many Pi radians are in a circle?
2
500
What is the cos(pi) equal to?
-1
500
In what year did the U.S. House of Representatives officially designate March 14 as National Pi Day?
2009
500
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