25.12 cm

The circumference of a circle is also known as the perimeter of the circle. The formula for the circumference of the circle is;

Circumference = 2*pi*r

pi= constant= 3.14

r= radius= 4 centimeter

r= 4 x 10^-2 meters= 0.04 meters

Circumference= 2* 3.14 * 0.04 meters

Circumference= 0.2512 meters

Circumference = 2*pi*r

pi= constant= 3.14

r= radius= 4 centimeter

r= 4 x 10^-2 meters= 0.04 meters

Circumference= 2* 3.14 * 0.04 meters

Circumference= 0.2512 meters

12.66