The diameter of a circle is 8 kilometers. What is the angle measure of an arc kilometers long?

Answer: 14.32 degrees

The circle has a diameter of 8 kilometers, so the perimeter would be:

perimeter = pi * diameter

perimeter = 22/7 * 8 kilometers = 25.14 kilometers

A full perimeter of the circle, which is 25.14km, has 360° angle. So 1km arc would be: 1km / 25.14 km * 360° = 14.32°