# What is the circumference of the circle below in terms of pi (π)?

# (a) πr^{2} (b) 2πr (c) πr

The circumference of a circle is the perimeter of the circle. It is the total length of the boundary of the circle.

## Answer: The circumference of a circle can be calculated using the expression (b) 2πr

Let's look into the expressions given.

**Explanation:**

(a) πr^{2 }is used to calculate the area of a circle, where r is the radius.

(b) 2πr is used to calculate the circumference of a circle, where r is the radius.

(c) πr is used to calculate the circumference of a semi-circle, where r is the radius.

### Thus, the formula to calculate the circumference of a circle is option (b) 2πr

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