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Learn how to calculate the circumference of a circle using simple formulas (C=πd or C=2πr). Understand its relation to radius & diameter, and explore real-life examples. The correct way to find the perimeter of a circle is to calculate it using the formula C = 2π × r. If the diameter or radius of a circle is known circumference of the circle can be easily calculated. The ratio of Circumference to the Diameter of a circle is always a constant and that is π. Are you ready to learn how to find the circumference of a circle? This free step-by-step guide explores what is the circumference of a circle and how to find the circumference of a circle using the circumference of a circle formula. Together we will work through several examples, including how to find circumference of a circle with diameter given and with radius given. Circumference of Circle Formula The circumference of a circle is equal to the length of its boundary, but the circle is a curved shape, its circumference can't be measured with a ruler.
