Circumference formula: The circumference formula of a circle is

The circumference formula of a circle is obtained by multiplying the diameter by pi (π). To recall, the circumference of a closed curve or circular object is the distance around its edge. The circumference of a circle has special importance in geometry and trigonometry. 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. Learn the three essential formulas to calculate the circumference of any circle. Use our interactive calculator, master step-by-step examples, test your knowledge with our quiz, and download a free study guide. Learn how to calculate the circumference of a circle using radius or diameter, with formulas and solved problems. Find the area and circumference of a circle with a radius of 4 inches, for example.