Equation for Circumference of a Circle

Equation for Circumference of a Circle We can say circumference of the circle is the actual length around the circle. We have an equation or formula to find the circumference of the circle, that is 2 x x r. Here r is the radius of the circle. And we know the value of the that is 3.14 or22/7. Example 1: Find the circumference of the circle with radius 21 cm. Solution: From the problem we can write, Radius = r = 21 cm We know the formula to find the Circumference of the circle That is C = 2 x x r Now we can plug the value in this formula, then we can write Circumference of the circle=C = 2 x x r From this we can write C = 2 x x r = 2 x 22/7x 21 = 132 cubic cm. Example 2: Find the circumference of the circle with diameter 28 cm. Solution: From the problem we can write, Diameter = d = 28 cm Radius =diameter/2 =14 cm We know the formula to find the Circumference of the circle That is C = 2 x x r Now we can plug the value in this formula, then we can write Circumference of the circle=C = 2 x x r From this we can write C = 2 x x r = 2 x 22/7x 14 = 4 x 22 = 88 cubic cm.