What is the Circumference of the Circle Below in Terms of pi (π)?


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

(a) πr2       (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) πris 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 (b) 2πr