Discover the Value of Pi (π) by Unrolling a Circle

This interactive tool helps you discover the mathematical constant Pi (π), which defines the relationship between a circle’s diameter and its circumference. It visually demonstrates that for any circle, the circumference is always about 3.14 times bigger than its diameter. 🧐

• Diameter (D): The distance across the circle through its center.
• Circumference (C): The distance around the circle.
• Pi (π): The constant ratio, C ÷ D.

Grab and drag the handle on the circle to change its size.

How to Use

The main controls are located in the sidebar, allowing you to explore the properties of the circle and visualize the concept of Pi.

Discovering Pi Tab 🥧

This tab contains all the tools for your exploration.

• Reveal Buttons: Click the series of reveal buttons (Diameter (D), Circumference (C), and π Formula) to walk through the calculation one step at a time. As you change the circle’s size, these values will update.
• Unroll Slider: The Unroll slider is the key feature here. Move it to watch the blue circumference transform into a straight line, making it easy to visually compare its length against the red diameter.
• Ruler: Use the Ruler button to toggle a ruler on the canvas. You can use it to manually measure and confirm the diameter.