What is the circumference of a 4 cm diameter?

1) The formula for finding the circumference of a circle looks like this: L = 2 * pi * r or L = d * pi. Where the number pi is a constant number equal to 3.14 (rounded to hundredths), r is the radius of the circle;
2) In the formula L = d * pi, instead of d, substitute the number 4 centimeters and find the length of this circle L = 4 * 3.14 = 12.56 centimeters.
Answer: 12.56 centimeters.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.