# How to find the area and circumference of a circle?

The area and circumference of a circle can be calculated when we know its radius.

## Answer: The area of a circle is A = π r^{2} and the circumference of a circle is C = 2 π r, where r is the radius of the circle.

Let r be the radius of a circle.

**Explanation:**

The formula to calculate the area of a circle is A = π r^{2}

The formula to calculate the circumference of a circle is C = 2 π r

where π is the constant which is always the ratio of the circumference of the circle to its diameter. We can take the value of π as 3.14 or 22/7