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Pi Meanings
Pi Day
Pi Formulas
Pi Trivia
100

The definition of pi (in regards to a circle)

What is the ratio of a circle’s circumference to its diameter?

100
Pi Day is celebrated on this date.
What is March 14? (3.14) ?
100
The formula for area of a circle
What is A=πr^2?
100
The value of pi fits into this classification of numbers.
What is irrational?
200
An approximate value of pi, correct to two decimal places
What is 3.14 ?
200
This famous mathematician’s birthday is on the same date as Pi Day.
Who is Albert Einstein?
200
The formula for circumference of a circle
What is C = 2πr or C = πd?
200
The number of centuries for which the letter pi has been used to represent this special mathematical ratio
What is 3? (This use of the letter pi first showed up in mathematical writings in about 1706.)
300
∏ is a letter from the alphabet of this language
What is Greek ?
300
The best time of day to celebrate Pi Day, according to the third, fourth, and fifth digits following the decimal
What is 1:59?
300
The formula for surface area of a cylinder
What is S = 2πrh + 2πr2h?
300
The U.S. state in which a bill was introduced to legislate the value of pi
What is Indiana?
400
∏ is the ____ letter of the alphabet. (1st, 2nd, 3rd, etc.)
What is 16th?
400
Another date to celebrate Pi Day—the 314th day of the year
What is November 10 (or November 9 in leap years)?
400
The formula for volume of a cone
What is V = 1/3πr^2h?
400

One of two ancient countries in which a value for pi was first used to calculate the area of a circle

What is Babylon or Egypt? (probably as early as 2000 or 3000 BC)