Ii) The diameter of the circle divides it into 2 equal parts and passes through the center. I) The outer line of the circle is equidistant from the center. Then put the radius in the area formula to calculate the area. For this first, we have to divide the circumference by π and then by 2. One can also find the area of a circle if the circumference is given. Next simply, put the value of the radius in the formula for circumference to find the circumference. If we need to calculate the circumference of a circle whose area is given, we will first find the radius from the area and then put it in the formula for circumference.įrom the area to get the radius, we should first divide by π and then find the square root of it. Therefore, for easier calculations, we can use π = 3.14 or π = 22/7. Here again, the value of π is non-terminating. The formula for calculation of the area of a circle is given by, The area of a circle is the area bounded by the is the area inside the circumference. The constant distance from its centre is called the radius of the circle. The diameter is considered to be the longest chord in the circle. The center of a circle is the center point in a circle from which all the distances to the point on the circle are equal.Ī chord or a line passing through the center of a circle is called the diameter. If the circumference of a circle is 68 cm, find the radius of this circle. If the circumference of a circle is 120 cm, find the radius of this circle.ĥ. Find the circumference of a circle if the radius is 36 cm. Find the circumference of a circle if the radius is 22 cm.

If the circumference of a circle is 24 cm, find the radius of this circle.Ģ. Question: Find the circumference of a circle if the radius is 14 cm. For even more simplification one can take the value of π = 3. Therefore, for calculations, we can use π = 22/7. Its value is 3.1415926535… Its value goes on to infinite decimal places.īut using an infinite number will make calculations almost impossible. π is an irrational number hence it cannot be written down as a finite decimal number. It is a constant so whatever be the circumference and the radius the ratio will be equal to π. For any given circle, this ratio will remain π. It gives the ratio of circumference to the diameter of a circle or the ratio of circumference to twice the radius. It is a very important constant in mathematics. The formula for calculation of circumference is, The circumference of a circle is measured in units of length like meter, centimetre, etc. The Formula for Circumference of the Circle The diameter of a circle is the maximum distance between any two points on the circumference. The distance between the centre and any point on the circumference is known as the radius of the circle. If we cut open the circle and straighten it the length of the boundary will be the measure of the circumference of the circle.Ī circle is made up of many points arranged equidistant from a single central point and The point is known as the centre of the circle. The circumference of a circle is the length of the boundary of the circle. In this article, we bring you a very important and interesting concept of geometry which is the Circumference of a circle. The concept is not only fun in learning rather it is fun in teaching also. So in simple terms, Circumference is nothing but the perimeter of a circle or an elliptical object. When you see a ball, the outer periphery of the ball which is visible to you is the circumference of the ball.

Circumference of a circle formula