What do we call the distance around a circle?

The distance around a circle is called the circumference. To calculate it, you can use the formula \( C = 2\pi r \), where \( C \) is the circumference, \( r \) is the radius, and \( \pi \) (pi) is approximately 3.14. This concept has been around since ancient civilizations, showcasing how early mathematicians began to understand the properties of shapes! In real life, circumference plays a crucial role in various fields like engineering, architecture, and even sports. For example, if you want to determine the amount of material needed to create a circular track, you would need to calculate its circumference. Having this understanding makes everything from crafting to construction a bit more precise and effective!