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The circumference to diameter of a circle is a ratio used to define the standard definition of Pi (π). Therefore, the circumference of a circle is 157 units. (Take π = 3.14)įirstly, we will write the circumference formula and then substitute the value of r (radius) in the same. Illustration: The radius of the circle is 25 units find the circumference of the circle.

Let us consider a practical illustration to understand how to calculate the circumference of a circle with the help of the circumference formula. It is the ratio of circumference to diameter, where C = πD. The value of π = 22/7 is used in various formulas. Pi is a special mathematical constant with a value approximated to 3.14159 or π = 22/7. Therefore, to calculate the circumference of a circle, we apply a formula that uses the radius or the diameter of the circle and the value of Pi (π). This is because a circle is a curved figure. How to Calculate Circumference of Circle?Īlthough the circumference of a circle is its length, it cannot be calculated with the help of a ruler (scale) like it is usually done for other polygons. Radius: The radius of a circle is the distance from the center of a circle to any point on the circumference of the circle.Diameter: The diameter is the distance across the circle through the center.

Center: The center is a point that is at a fixed distance from any other point from the circumference.These are the three most important elements of a circle. Now let’s learn about the elements that make up circumference.

If we open a circle and measure the boundary just like we measure a straight line, we get the circumference of the circle in terms of units of length like centimeters, meters, or kilometers. The circumference of a circle refers to the measure of its boundary. The circumference is the Length of the Boundary. This distance or boundary is called the circumference of the park which is in the shape of a circle. If a boy starts running from point 'A' and reaches the same point after taking one complete round of the park, a distance is covered by him. Let us understand this concept using an example. The circumference of a circle is its boundary or the length of the complete arc of a circle.