Answer:
4π ≈ 12.5663706144
Explanation:
The circumference of a circle is 2πr, or 2*pi*radius
Suppose the circle has a diameter of 4 inches. A diameter is 2x the radius, of which we are looking for, therefore:
4÷2=2 inches (radius length)
Now that we have the radius, let us substitute to find the circumference:
2πr=
2π2=
4π≈
12.5663706144
I hope this helped! Let me know if you have any further questions :)