The Many Digits of π
The first three digits of π
What is 3.14?
The formula to find the circumference of a circle.
What is 2 × π × radius?
This ancient Greek mathematician is famous for studying circles and is often called the “father of geometry.”
Who is Archimedes?
This tasty food is often eaten on March 14 to celebrate π.
What is pie?
π is greater than 3 but less than this number.
What is 4?
This number is the 5th digit of π after the decimal point
What is 9?
The formula to find the area of a circle.
What is π × radius²?
The Greek letter “π” was first used to represent this part of a circle.
What is the perimeter (or distance around the circle)?
You often see π used when cooking or baking this round food that can come in many flavors
What is a pizza?
Some shapes, like circles, are special because they don’t have any corners. Shapes like this are called…
What are round shapes or curves?
The special day that celebrates π every year on March 14.
What is Pi Day?
Half of a circle is called this.
What is a semicircle?
People have been trying to figure out π for thousands of years. It was first estimated by people in this ancient civilization along the Nile.
What is Egypt?
You might see π in real life when building things that are round, like wheels, clocks, or fountains.
What is circles?
that never ends and never repeats. What type of number is it?
What is an irrational number?
A pizza has a radius of 9 centimeters. Its area is π × 9² = ? (in terms of π)
What is 81π centimeters squared?
This famous mathematician helped make the symbol π popular in math books in the 1700s.
Who is Leonhard Euler?
Astronomers use π to calculate things in space, like the paths of planets around this object.
What is the Sun?
The number 22/7 is often used as a simple version of this famous math number.
What is π?
π has been calculated to trillions of these.
What are digits?
This part of a circle connects the center to any point on the edge.
What is the radius?
Before calculators, mathematicians estimated π by drawing shapes with many straight sides inside and outside a circle. What is the name for these shapes?
What are polygons?
This popular competition challenges people to remember as many digits of π as possible.
What is a pi recitation contest?
This number, like π, is also famous in math and starts with 2.718…
What is e?