Answer: 1.571 inches
Explanation:
The formula for a circumference of a circle is C = 2πr, where r is the radius of the circle. The radius is half of the diameter. We know that the diameter is 1/2 of an inch, so the radius is 1/4 of an inch.
So, plug 1/4 for r to get C = 2π(1/4) or approximately 1.571 inches.