Pi Basics
This is the approximate value of pi rounded to two decimal places.
3.14
The first three digits of pi.
3.14
The formula for the circumference of a circle.
C = πd or C = 2πr
This dessert is traditionally eaten on March 14 to celebrate Pi Day.
Pie
Pi Day is celebrated on this date.
March 14
Pi represents the ratio of a circle’s circumference to this.
Diameter
The first five digits of pi.
3.1415
The formula for the area of a circle.
A = πr²
Pi is used to calculate the volume of this 3D shape: V = πr²h.
Cylinder
Albert Einstein was born on Pi Day in this year.
1879
The symbol used to represent pi in mathematics.
Greek Letter π
The 6th digit of pi (after 3.1415).
9
If the radius is 5, this is the area of the circle (in terms of π).
25π
Engineers use pi when designing this common object with wheels.
car (car wheel)
This many decimal places of pi have been calculated (over this number).
1 Trillion (over 1 Trillion)
Pi is classified as this type of number because it never ends and never repeats.
Irrational Number
The next four digits after 3.14159.
2653
If the diameter is 10, this is the circumference (in terms of π).
10π
NASA uses pi to calculate the orbits of these objects.
Planets
Pi is used in this branch of math that studies triangles and angles.
Trigonometry
This ancient mathematician first approximated pi using polygons.
The first ten digits of pi.
3.141592653
If a circle has a radius of 7, this is its circumference.
14π
Pi is essential in calculating waves in this branch of physics.
physics involving waves or trigonometry
This world record involves reciting thousands of digits of pi from memory.
Memorizing Digits of Pi