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Pi

Adapted from Wikipedia · Explorer experience

A colorful mathematical fractal pattern known as the Mandelbrot set, showing intricate and beautiful designs created through numbers and equations.

What Is Pi?

Pi is a very special number that helps us understand circles. It is about 3.14, but it goes on forever without repeating! Pi is the name we give to the distance around a circle (called the circumference) divided by the distance across the circle (called the diameter). No matter how big or small the circle is, this number always stays the same.

Why Is Pi Important?

Pi is super important in math and science. It helps us solve problems about circles and many other shapes. For example, pi helps us find out how far around a wheel is or how much space is inside a round cookie. It is used in geometry, physics, and even when we make computers work better!

A Very Long Time Ago

People have been interested in pi for a very long time. Ancient Egyptians and Babylonians tried to guess what pi was like. They were close, but not perfect. Later, a smart man named Archimedes from Greece used shapes with many sides to get closer to the real value of pi. His clever idea helped others for many years!

Fun With Pi

Pi is so special that some people love to remember lots of its digits. They even make poems where the number of letters in each word matches the digits of pi! Every year on March 14, people celebrate Pi Day by eating pie and learning more about this amazing number.

Images

Animation showing how the distance around a circle relates to its diameter, introducing the concept of pi (π).
A mathematical diagram showing the unrolling of pi, a value used in geometry and calculations.
A thoughtful scholar from the 1600s, depicted in a painting by Domenico Fetti, surrounded by symbols of learning and discovery.
Portrait of the famous scientist Isaac Newton from the late 1600s.
Portrait of William Jones, an 18th-century Welsh mathematician, painted by William Hogarth.
Portrait of Leonhard Euler, an important mathematician from the 18th century.
A mathematical diagram illustrating the Prüfer 2-group, a concept in group theory.
Animation showing how a tiny silver particle moves randomly on a surface, illustrating a scientific concept.
Portrait of Srinivasa Ramanujan, the famous Indian mathematician known for his contributions to number theory.
An animation showing how random points can help calculate the value of pi by comparing points inside and outside a circle.
Historical illustration of the ancient city of Carthage, showcasing its layout and architecture from 1894.
An animated illustration of a mathematical geodesic, showing the path of a point moving through space according to specific rules.

This article is a child-friendly adaptation of the Wikipedia article on Pi, available under CC BY-SA 4.0.

Images from Wikimedia Commons. Tap any image to view credits and license.