The circumference of a circle is divided into a certain number of units called radians. A radian is the angle subtended by an arc of a circle that has the same length as the radius of the circle. To find this question's answer, we must find how many radians comprise the entire circumference of a circle.
We must first recall that the circumference of a circle is 2π times the radius, according to the formula C=2πr. Since a radian is defined based on the radius of the circle, the entire circumference of the circle, being 2π times the radius, is also 2π radians.
Thus, a complete circle's circumference is approximately 6.28 radians, as 2 times π (around 3.14) equals approximately 6.28. Hence, the sentence would be: "The circumference of a circle is divided into approximately 6.28 radians."