What is circumference? Learn the circumference equation and definition. See examples of how to calculate circumference when given the diameter or radius.

The lesson will introduce circumference and discuss its relationship with diameter and radius via circumference and diameter formula and calculation.

Given the circumference, C, of a circle, the area can be found by dividing the circumference by 2, and multiplying that result by the radius. That is, A = (C / 2)r.

Learn how to Find the Circumference and Area of a circle, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

What is the diameter of a circle? Learn the formula, and see examples of how to find the diameter of a circle using the radius, circumference, or area.

Area of a circle: Area of a circle refers to the space enclosed by the circumference of the circle. For circles in maths, area can be calculated using radius or diameter (parts of circle).

In this lesson, you will learn what circumference is, its formula and the tools you need to find circumference. Then, you can try finding the circumference of a circle on your own!

Learn how to describe the relationship between the circumference & area of a circle, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn to define the radius of a circle. Learn what the radius formula is and how to find the radius of a circle given area, diameter, or circumference. See examples.

Dividing the circumference by 2pi will give the radius of a circle because the circumference is the product of multiplying 2pi and the radius. What is the formula to find the radius?