What is the diameter of a #8 re-bar?

Answer: B — 1 inch

A #8 re-bar is defined in terms of its nominal diameter, which corresponds to a specific size in the American standard for reinforcing bars. The designation #8 indicates that the re-bar has a diameter of 1 inch. This is a standardized measurement that helps ensure consistency in construction materials across various projects. Understanding the sizing of re-bar is crucial for structural integrity, as the diameter plays a significant role in load-bearing capacity and resistance to shear forces. Therefore, for any construction project involving reinforced concrete, accurately knowing the size of the re-bar being used is essential for meeting design specifications and safety regulations.