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Pi (π) is a special number that is used to find the circumference (perimeter) of a circle in math. Pi is a very important number in mathematics and is used in many different ways to find measurements for circles and other shapes.
The perimeter of a circle is like walking around the edge of a cookie. You can measure the distance around the edge of a circle, which is called the perimeter. To calculate it you need the radius o the diameter and the number pi