Circumference of a Circle Calculator
https://www.gigacalculator.com/calculators/circumference-of-circle-calculator.php
WEBThe circumference of a circle is calculated using the formula: 2 x π x radius, where π is a mathematical constant, equal to about 3.14159. It was originally defined as the ratio of a circle's circumference to its diameter (see second formula below on why) and appears in many formulas in mathematics, physics, and everyday life.
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