Understanding Circumference of Circles

The video tutorial explains the concept of circumference, which is the distance around a circle. It introduces the formula for calculating circumference using the diameter, which is circumference = pi x diameter, where pi is approximately 3.14. An example is provided using a circle with a diameter of 20 centimeters, resulting in a circumference of 62.8 centimeters. The tutorial also covers how to calculate circumference using the radius with the formula circumference = 2 x pi x radius, demonstrated with a cake having a radius of 6 centimeters, resulting in a circumference of 37.68 centimeters.

What is the formula for calculating the circumference of a circle?

How is pi defined in relation to a circle?

If the diameter of a circle is 20 centimeters, what is its circumference?

What is the circumference of a cake if the radius is 6 centimeters?

Explain how to calculate the circumference if only the radius is known.